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Finding the Fourth Proportional to 66.66, 99.45 and 64.87

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Solution

The fourth proportional to 66.66, 99.45 and 64.87 is: 96.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.66 : 99.45 = 64.87 : x
  2. Step 2: Convert to fraction form
    66.66/99.45 = 64.87/x
  3. Step 3: Cross multiply
    66.66x = 99.45 × 64.87
  4. Step 4: Simplify right side
    66.66x = 6,451.45
  5. Step 5: Solve for x
    x = 6,451.45/66.66
  6. Step 6: Final answer
    x = 96.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.