Home / 129,123.90-178,190.79-71,761.41

Finding the Fourth Proportional to 129,123.90, 178,190.79 and 71,761.41

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Solution

The fourth proportional to 129,123.90, 178,190.79 and 71,761.41 is: 99,030.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,123.90 : 178,190.79 = 71,761.41 : x
  2. Step 2: Convert to fraction form
    129,123.90/178,190.79 = 71,761.41/x
  3. Step 3: Cross multiply
    129,123.90x = 178,190.79 × 71,761.41
  4. Step 4: Simplify right side
    129,123.90x = 12,787,222,339.41
  5. Step 5: Solve for x
    x = 12,787,222,339.41/129,123.90
  6. Step 6: Final answer
    x = 99,030.64

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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.