Home / 129,699.72-178,955.14-78,711.31

Finding the Fourth Proportional to 129,699.72, 178,955.14 and 78,711.31

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Solution

The fourth proportional to 129,699.72, 178,955.14 and 78,711.31 is: 108,603.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,699.72 : 178,955.14 = 78,711.31 : x
  2. Step 2: Convert to fraction form
    129,699.72/178,955.14 = 78,711.31/x
  3. Step 3: Cross multiply
    129,699.72x = 178,955.14 × 78,711.31
  4. Step 4: Simplify right side
    129,699.72x = 14,085,793,500.63
  5. Step 5: Solve for x
    x = 14,085,793,500.63/129,699.72
  6. Step 6: Final answer
    x = 108,603.11

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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.