Home / 129,515.97-178,728.09-72,155.27

Finding the Fourth Proportional to 129,515.97, 178,728.09 and 72,155.27

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Solution

The fourth proportional to 129,515.97, 178,728.09 and 72,155.27 is: 99,572.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,515.97 : 178,728.09 = 72,155.27 : x
  2. Step 2: Convert to fraction form
    129,515.97/178,728.09 = 72,155.27/x
  3. Step 3: Cross multiply
    129,515.97x = 178,728.09 × 72,155.27
  4. Step 4: Simplify right side
    129,515.97x = 12,896,172,696.89
  5. Step 5: Solve for x
    x = 12,896,172,696.89/129,515.97
  6. Step 6: Final answer
    x = 99,572.07

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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.