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Finding the Fourth Proportional to 100,432.59, 138,780.36 and 73,161.21

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Solution

The fourth proportional to 100,432.59, 138,780.36 and 73,161.21 is: 101,096.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,432.59 : 138,780.36 = 73,161.21 : x
  2. Step 2: Convert to fraction form
    100,432.59/138,780.36 = 73,161.21/x
  3. Step 3: Cross multiply
    100,432.59x = 138,780.36 × 73,161.21
  4. Step 4: Simplify right side
    100,432.59x = 10,153,339,061.84
  5. Step 5: Solve for x
    x = 10,153,339,061.84/100,432.59
  6. Step 6: Final answer
    x = 101,096.06

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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.