Home / 129,590.43-178,813.11-72,217.19

Finding the Fourth Proportional to 129,590.43, 178,813.11 and 72,217.19

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Solution

The fourth proportional to 129,590.43, 178,813.11 and 72,217.19 is: 99,647.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,590.43 : 178,813.11 = 72,217.19 : x
  2. Step 2: Convert to fraction form
    129,590.43/178,813.11 = 72,217.19/x
  3. Step 3: Cross multiply
    129,590.43x = 178,813.11 × 72,217.19
  4. Step 4: Simplify right side
    129,590.43x = 12,913,379,445.30
  5. Step 5: Solve for x
    x = 12,913,379,445.30/129,590.43
  6. Step 6: Final answer
    x = 99,647.63

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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.