Home / 129,390.12-178,543.92-72,800.28

Finding the Fourth Proportional to 129,390.12, 178,543.92 and 72,800.28

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Solution

The fourth proportional to 129,390.12, 178,543.92 and 72,800.28 is: 100,456.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,390.12 : 178,543.92 = 72,800.28 : x
  2. Step 2: Convert to fraction form
    129,390.12/178,543.92 = 72,800.28/x
  3. Step 3: Cross multiply
    129,390.12x = 178,543.92 × 72,800.28
  4. Step 4: Simplify right side
    129,390.12x = 12,998,047,368.30
  5. Step 5: Solve for x
    x = 12,998,047,368.30/129,390.12
  6. Step 6: Final answer
    x = 100,456.26

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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.