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Finding the Fourth Proportional to 66.28, 99.44 and 64.91

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Solution

The fourth proportional to 66.28, 99.44 and 64.91 is: 97.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.28 : 99.44 = 64.91 : x
  2. Step 2: Convert to fraction form
    66.28/99.44 = 64.91/x
  3. Step 3: Cross multiply
    66.28x = 99.44 × 64.91
  4. Step 4: Simplify right side
    66.28x = 6,454.15
  5. Step 5: Solve for x
    x = 6,454.15/66.28
  6. Step 6: Final answer
    x = 97.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.