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Finding the Fourth Proportional to 129,339.36, 178,486.56 and 72,750.78

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Solution

The fourth proportional to 129,339.36, 178,486.56 and 72,750.78 is: 100,395.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,339.36 : 178,486.56 = 72,750.78 : x
  2. Step 2: Convert to fraction form
    129,339.36/178,486.56 = 72,750.78/x
  3. Step 3: Cross multiply
    129,339.36x = 178,486.56 × 72,750.78
  4. Step 4: Simplify right side
    129,339.36x = 12,985,036,459.52
  5. Step 5: Solve for x
    x = 12,985,036,459.52/129,339.36
  6. Step 6: Final answer
    x = 100,395.09

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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.