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Finding the Fourth Proportional to 64.12, 88.33 and 63.31

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Solution

The fourth proportional to 64.12, 88.33 and 63.31 is: 87.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.12 : 88.33 = 63.31 : x
  2. Step 2: Convert to fraction form
    64.12/88.33 = 63.31/x
  3. Step 3: Cross multiply
    64.12x = 88.33 × 63.31
  4. Step 4: Simplify right side
    64.12x = 5,591.74
  5. Step 5: Solve for x
    x = 5,591.74/64.12
  6. Step 6: Final answer
    x = 87.21

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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.