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Finding the Fourth Proportional to 100,342.60, 138,479 and 55,630.60

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Solution

The fourth proportional to 100,342.60, 138,479 and 55,630.60 is: 76,773.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,342.60 : 138,479 = 55,630.60 : x
  2. Step 2: Convert to fraction form
    100,342.60/138,479 = 55,630.60/x
  3. Step 3: Cross multiply
    100,342.60x = 138,479 × 55,630.60
  4. Step 4: Simplify right side
    100,342.60x = 7,703,669,857.40
  5. Step 5: Solve for x
    x = 7,703,669,857.40/100,342.60
  6. Step 6: Final answer
    x = 76,773.67

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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.