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Finding the Fourth Proportional to 129,452.48, 178,699.48 and 87,035.60

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Solution

The fourth proportional to 129,452.48, 178,699.48 and 87,035.60 is: 120,146.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,452.48 : 178,699.48 = 87,035.60 : x
  2. Step 2: Convert to fraction form
    129,452.48/178,699.48 = 87,035.60/x
  3. Step 3: Cross multiply
    129,452.48x = 178,699.48 × 87,035.60
  4. Step 4: Simplify right side
    129,452.48x = 15,553,216,461.49
  5. Step 5: Solve for x
    x = 15,553,216,461.49/129,452.48
  6. Step 6: Final answer
    x = 120,146.15

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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.