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Finding the Fourth Proportional to 66.43, 99.05 and 66.34

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Solution

The fourth proportional to 66.43, 99.05 and 66.34 is: 98.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.43 : 99.05 = 66.34 : x
  2. Step 2: Convert to fraction form
    66.43/99.05 = 66.34/x
  3. Step 3: Cross multiply
    66.43x = 99.05 × 66.34
  4. Step 4: Simplify right side
    66.43x = 6,570.98
  5. Step 5: Solve for x
    x = 6,570.98/66.43
  6. Step 6: Final answer
    x = 98.92

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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.