Home / 129,237.12-178,332.84-72,647.28

Finding the Fourth Proportional to 129,237.12, 178,332.84 and 72,647.28

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Solution

The fourth proportional to 129,237.12, 178,332.84 and 72,647.28 is: 100,245.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,237.12 : 178,332.84 = 72,647.28 : x
  2. Step 2: Convert to fraction form
    129,237.12/178,332.84 = 72,647.28/x
  3. Step 3: Cross multiply
    129,237.12x = 178,332.84 × 72,647.28
  4. Step 4: Simplify right side
    129,237.12x = 12,955,395,760.68
  5. Step 5: Solve for x
    x = 12,955,395,760.68/129,237.12
  6. Step 6: Final answer
    x = 100,245.16

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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.