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Finding the Fourth Proportional to 66.42, 91.70 and 45.66

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Solution

The fourth proportional to 66.42, 91.70 and 45.66 is: 63.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.42 : 91.70 = 45.66 : x
  2. Step 2: Convert to fraction form
    66.42/91.70 = 45.66/x
  3. Step 3: Cross multiply
    66.42x = 91.70 × 45.66
  4. Step 4: Simplify right side
    66.42x = 4,186.79
  5. Step 5: Solve for x
    x = 4,186.79/66.42
  6. Step 6: Final answer
    x = 63.04

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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.