Home / 129,285.12-178,398.96-72,695.28

Finding the Fourth Proportional to 129,285.12, 178,398.96 and 72,695.28

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Solution

The fourth proportional to 129,285.12, 178,398.96 and 72,695.28 is: 100,311.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,285.12 : 178,398.96 = 72,695.28 : x
  2. Step 2: Convert to fraction form
    129,285.12/178,398.96 = 72,695.28/x
  3. Step 3: Cross multiply
    129,285.12x = 178,398.96 × 72,695.28
  4. Step 4: Simplify right side
    129,285.12x = 12,968,762,348.91
  5. Step 5: Solve for x
    x = 12,968,762,348.91/129,285.12
  6. Step 6: Final answer
    x = 100,311.33

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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.