Home / 129,308.79-178,444.41-72,720.17

Finding the Fourth Proportional to 129,308.79, 178,444.41 and 72,720.17

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Solution

The fourth proportional to 129,308.79, 178,444.41 and 72,720.17 is: 100,352.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,308.79 : 178,444.41 = 72,720.17 : x
  2. Step 2: Convert to fraction form
    129,308.79/178,444.41 = 72,720.17/x
  3. Step 3: Cross multiply
    129,308.79x = 178,444.41 × 72,720.17
  4. Step 4: Simplify right side
    129,308.79x = 12,976,506,938.53
  5. Step 5: Solve for x
    x = 12,976,506,938.53/129,308.79
  6. Step 6: Final answer
    x = 100,352.86

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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.