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Finding the Fourth Proportional to 63.02, 86.85 and 55.35

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Solution

The fourth proportional to 63.02, 86.85 and 55.35 is: 76.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.02 : 86.85 = 55.35 : x
  2. Step 2: Convert to fraction form
    63.02/86.85 = 55.35/x
  3. Step 3: Cross multiply
    63.02x = 86.85 × 55.35
  4. Step 4: Simplify right side
    63.02x = 4,807.15
  5. Step 5: Solve for x
    x = 4,807.15/63.02
  6. Step 6: Final answer
    x = 76.28

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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.