Home / 129,388.20-178,543.02-72,798.36

Finding the Fourth Proportional to 129,388.20, 178,543.02 and 72,798.36

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Solution

The fourth proportional to 129,388.20, 178,543.02 and 72,798.36 is: 100,454.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,388.20 : 178,543.02 = 72,798.36 : x
  2. Step 2: Convert to fraction form
    129,388.20/178,543.02 = 72,798.36/x
  3. Step 3: Cross multiply
    129,388.20x = 178,543.02 × 72,798.36
  4. Step 4: Simplify right side
    129,388.20x = 12,997,639,045.45
  5. Step 5: Solve for x
    x = 12,997,639,045.45/129,388.20
  6. Step 6: Final answer
    x = 100,454.59

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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.