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Finding the Fourth Proportional to 129,781.50, 179,098.74 and 70,165.50

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Solution

The fourth proportional to 129,781.50, 179,098.74 and 70,165.50 is: 96,828.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,781.50 : 179,098.74 = 70,165.50 : x
  2. Step 2: Convert to fraction form
    129,781.50/179,098.74 = 70,165.50/x
  3. Step 3: Cross multiply
    129,781.50x = 179,098.74 × 70,165.50
  4. Step 4: Simplify right side
    129,781.50x = 12,566,552,641.47
  5. Step 5: Solve for x
    x = 12,566,552,641.47/129,781.50
  6. Step 6: Final answer
    x = 96,828.54

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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.