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Finding the Fourth Proportional to 129,776.29, 179,078.84 and 78,816.91

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Solution

The fourth proportional to 129,776.29, 179,078.84 and 78,816.91 is: 108,759.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,776.29 : 179,078.84 = 78,816.91 : x
  2. Step 2: Convert to fraction form
    129,776.29/179,078.84 = 78,816.91/x
  3. Step 3: Cross multiply
    129,776.29x = 179,078.84 × 78,816.91
  4. Step 4: Simplify right side
    129,776.29x = 14,114,440,421.10
  5. Step 5: Solve for x
    x = 14,114,440,421.10/129,776.29
  6. Step 6: Final answer
    x = 108,759.78

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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.