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Finding the Fourth Proportional to 63.84, 87.68 and 56.55

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Solution

The fourth proportional to 63.84, 87.68 and 56.55 is: 77.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.84 : 87.68 = 56.55 : x
  2. Step 2: Convert to fraction form
    63.84/87.68 = 56.55/x
  3. Step 3: Cross multiply
    63.84x = 87.68 × 56.55
  4. Step 4: Simplify right side
    63.84x = 4,958.02
  5. Step 5: Solve for x
    x = 4,958.02/63.84
  6. Step 6: Final answer
    x = 77.66

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.