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Finding the Fourth Proportional to 100,818.51, 139,122.39 and 59,980.38

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Solution

The fourth proportional to 100,818.51, 139,122.39 and 59,980.38 is: 82,768.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,818.51 : 139,122.39 = 59,980.38 : x
  2. Step 2: Convert to fraction form
    100,818.51/139,122.39 = 59,980.38/x
  3. Step 3: Cross multiply
    100,818.51x = 139,122.39 × 59,980.38
  4. Step 4: Simplify right side
    100,818.51x = 8,344,613,818.71
  5. Step 5: Solve for x
    x = 8,344,613,818.71/100,818.51
  6. Step 6: Final answer
    x = 82,768.67

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.