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Finding the Fourth Proportional to 64.66, 88.70 and 63.31

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Solution

The fourth proportional to 64.66, 88.70 and 63.31 is: 86.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.66 : 88.70 = 63.31 : x
  2. Step 2: Convert to fraction form
    64.66/88.70 = 63.31/x
  3. Step 3: Cross multiply
    64.66x = 88.70 × 63.31
  4. Step 4: Simplify right side
    64.66x = 5,615.60
  5. Step 5: Solve for x
    x = 5,615.60/64.66
  6. Step 6: Final answer
    x = 86.85

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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.