Home / 129,102.19-178,177.73-72,513.56

Finding the Fourth Proportional to 129,102.19, 178,177.73 and 72,513.56

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Solution

The fourth proportional to 129,102.19, 178,177.73 and 72,513.56 is: 100,078.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,102.19 : 178,177.73 = 72,513.56 : x
  2. Step 2: Convert to fraction form
    129,102.19/178,177.73 = 72,513.56/x
  3. Step 3: Cross multiply
    129,102.19x = 178,177.73 × 72,513.56
  4. Step 4: Simplify right side
    129,102.19x = 12,920,301,597.90
  5. Step 5: Solve for x
    x = 12,920,301,597.90/129,102.19
  6. Step 6: Final answer
    x = 100,078.10

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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.