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Finding the Fourth Proportional to 63.91, 88.39 and 53.72

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Solution

The fourth proportional to 63.91, 88.39 and 53.72 is: 74.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.91 : 88.39 = 53.72 : x
  2. Step 2: Convert to fraction form
    63.91/88.39 = 53.72/x
  3. Step 3: Cross multiply
    63.91x = 88.39 × 53.72
  4. Step 4: Simplify right side
    63.91x = 4,748.31
  5. Step 5: Solve for x
    x = 4,748.31/63.91
  6. Step 6: Final answer
    x = 74.30

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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.