Home / 129,089.07-178,113.80-78,100.53

Finding the Fourth Proportional to 129,089.07, 178,113.80 and 78,100.53

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Solution

The fourth proportional to 129,089.07, 178,113.80 and 78,100.53 is: 107,761.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,089.07 : 178,113.80 = 78,100.53 : x
  2. Step 2: Convert to fraction form
    129,089.07/178,113.80 = 78,100.53/x
  3. Step 3: Cross multiply
    129,089.07x = 178,113.80 × 78,100.53
  4. Step 4: Simplify right side
    129,089.07x = 13,910,781,879.10
  5. Step 5: Solve for x
    x = 13,910,781,879.10/129,089.07
  6. Step 6: Final answer
    x = 107,761.12

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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.