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Finding the Fourth Proportional to 129,758.86, 179,074.29 and 72,410.86

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Solution

The fourth proportional to 129,758.86, 179,074.29 and 72,410.86 is: 99,930.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,758.86 : 179,074.29 = 72,410.86 : x
  2. Step 2: Convert to fraction form
    129,758.86/179,074.29 = 72,410.86/x
  3. Step 3: Cross multiply
    129,758.86x = 179,074.29 × 72,410.86
  4. Step 4: Simplify right side
    129,758.86x = 12,966,923,342.79
  5. Step 5: Solve for x
    x = 12,966,923,342.79/129,758.86
  6. Step 6: Final answer
    x = 99,930.93

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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.