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Finding the Fourth Proportional to 63.40, 87.69 and 56.12

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Solution

The fourth proportional to 63.40, 87.69 and 56.12 is: 77.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.40 : 87.69 = 56.12 : x
  2. Step 2: Convert to fraction form
    63.40/87.69 = 56.12/x
  3. Step 3: Cross multiply
    63.40x = 87.69 × 56.12
  4. Step 4: Simplify right side
    63.40x = 4,921.16
  5. Step 5: Solve for x
    x = 4,921.16/63.40
  6. Step 6: Final answer
    x = 77.62

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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.