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Finding the Fourth Proportional to 63.15, 87.08 and 51.47

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Solution

The fourth proportional to 63.15, 87.08 and 51.47 is: 70.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.15 : 87.08 = 51.47 : x
  2. Step 2: Convert to fraction form
    63.15/87.08 = 51.47/x
  3. Step 3: Cross multiply
    63.15x = 87.08 × 51.47
  4. Step 4: Simplify right side
    63.15x = 4,482.01
  5. Step 5: Solve for x
    x = 4,482.01/63.15
  6. Step 6: Final answer
    x = 70.97

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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.