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Finding the Fourth Proportional to 155,881.52, 215,103.48 and 87,915.20

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Solution

The fourth proportional to 155,881.52, 215,103.48 and 87,915.20 is: 121,315.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,881.52 : 215,103.48 = 87,915.20 : x
  2. Step 2: Convert to fraction form
    155,881.52/215,103.48 = 87,915.20/x
  3. Step 3: Cross multiply
    155,881.52x = 215,103.48 × 87,915.20
  4. Step 4: Simplify right side
    155,881.52x = 18,910,865,464.90
  5. Step 5: Solve for x
    x = 18,910,865,464.90/155,881.52
  6. Step 6: Final answer
    x = 121,315.63

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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.