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Finding the Fourth Proportional to 63.42, 87.61 and 51.23

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Solution

The fourth proportional to 63.42, 87.61 and 51.23 is: 70.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.42 : 87.61 = 51.23 : x
  2. Step 2: Convert to fraction form
    63.42/87.61 = 51.23/x
  3. Step 3: Cross multiply
    63.42x = 87.61 × 51.23
  4. Step 4: Simplify right side
    63.42x = 4,488.26
  5. Step 5: Solve for x
    x = 4,488.26/63.42
  6. Step 6: Final answer
    x = 70.77

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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.