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Finding the Fourth Proportional to 129,558.50, 178,835.48 and 75,860.78

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Solution

The fourth proportional to 129,558.50, 178,835.48 and 75,860.78 is: 104,714.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,558.50 : 178,835.48 = 75,860.78 : x
  2. Step 2: Convert to fraction form
    129,558.50/178,835.48 = 75,860.78/x
  3. Step 3: Cross multiply
    129,558.50x = 178,835.48 × 75,860.78
  4. Step 4: Simplify right side
    129,558.50x = 13,566,598,625.17
  5. Step 5: Solve for x
    x = 13,566,598,625.17/129,558.50
  6. Step 6: Final answer
    x = 104,714.08

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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.