Home / 129,319.49-178,459.13-72,730.86

Finding the Fourth Proportional to 129,319.49, 178,459.13 and 72,730.86

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Solution

The fourth proportional to 129,319.49, 178,459.13 and 72,730.86 is: 100,367.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,319.49 : 178,459.13 = 72,730.86 : x
  2. Step 2: Convert to fraction form
    129,319.49/178,459.13 = 72,730.86/x
  3. Step 3: Cross multiply
    129,319.49x = 178,459.13 × 72,730.86
  4. Step 4: Simplify right side
    129,319.49x = 12,979,485,636.10
  5. Step 5: Solve for x
    x = 12,979,485,636.10/129,319.49
  6. Step 6: Final answer
    x = 100,367.59

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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.