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Finding the Fourth Proportional to 63.61, 87.73 and 51.30

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Solution

The fourth proportional to 63.61, 87.73 and 51.30 is: 70.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.61 : 87.73 = 51.30 : x
  2. Step 2: Convert to fraction form
    63.61/87.73 = 51.30/x
  3. Step 3: Cross multiply
    63.61x = 87.73 × 51.30
  4. Step 4: Simplify right side
    63.61x = 4,500.55
  5. Step 5: Solve for x
    x = 4,500.55/63.61
  6. Step 6: Final answer
    x = 70.75

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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.