Home / 129,520.86-178,689.62-78,514.98

Finding the Fourth Proportional to 129,520.86, 178,689.62 and 78,514.98

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Solution

The fourth proportional to 129,520.86, 178,689.62 and 78,514.98 is: 108,320.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,520.86 : 178,689.62 = 78,514.98 : x
  2. Step 2: Convert to fraction form
    129,520.86/178,689.62 = 78,514.98/x
  3. Step 3: Cross multiply
    129,520.86x = 178,689.62 × 78,514.98
  4. Step 4: Simplify right side
    129,520.86x = 14,029,811,547.93
  5. Step 5: Solve for x
    x = 14,029,811,547.93/129,520.86
  6. Step 6: Final answer
    x = 108,320.86

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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.