Home / 129,686.05-178,963.18-72,327.12

Finding the Fourth Proportional to 129,686.05, 178,963.18 and 72,327.12

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Solution

The fourth proportional to 129,686.05, 178,963.18 and 72,327.12 is: 99,809.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,686.05 : 178,963.18 = 72,327.12 : x
  2. Step 2: Convert to fraction form
    129,686.05/178,963.18 = 72,327.12/x
  3. Step 3: Cross multiply
    129,686.05x = 178,963.18 × 72,327.12
  4. Step 4: Simplify right side
    129,686.05x = 12,943,891,395.44
  5. Step 5: Solve for x
    x = 12,943,891,395.44/129,686.05
  6. Step 6: Final answer
    x = 99,809.44

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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.