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Finding the Fourth Proportional to 100,865.01, 139,146.95 and 65,066.55

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Solution

The fourth proportional to 100,865.01, 139,146.95 and 65,066.55 is: 89,761.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,865.01 : 139,146.95 = 65,066.55 : x
  2. Step 2: Convert to fraction form
    100,865.01/139,146.95 = 65,066.55/x
  3. Step 3: Cross multiply
    100,865.01x = 139,146.95 × 65,066.55
  4. Step 4: Simplify right side
    100,865.01x = 9,053,811,654.19
  5. Step 5: Solve for x
    x = 9,053,811,654.19/100,865.01
  6. Step 6: Final answer
    x = 89,761.67

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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.