Home / 129,055.87-178,077.85-72,456.31

Finding the Fourth Proportional to 129,055.87, 178,077.85 and 72,456.31

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Solution

The fourth proportional to 129,055.87, 178,077.85 and 72,456.31 is: 99,978.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,055.87 : 178,077.85 = 72,456.31 : x
  2. Step 2: Convert to fraction form
    129,055.87/178,077.85 = 72,456.31/x
  3. Step 3: Cross multiply
    129,055.87x = 178,077.85 × 72,456.31
  4. Step 4: Simplify right side
    129,055.87x = 12,902,863,903.73
  5. Step 5: Solve for x
    x = 12,902,863,903.73/129,055.87
  6. Step 6: Final answer
    x = 99,978.90

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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.