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Finding the Fourth Proportional to 66.61, 91.91 and 41.70

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Solution

The fourth proportional to 66.61, 91.91 and 41.70 is: 57.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.61 : 91.91 = 41.70 : x
  2. Step 2: Convert to fraction form
    66.61/91.91 = 41.70/x
  3. Step 3: Cross multiply
    66.61x = 91.91 × 41.70
  4. Step 4: Simplify right side
    66.61x = 3,832.65
  5. Step 5: Solve for x
    x = 3,832.65/66.61
  6. Step 6: Final answer
    x = 57.54

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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.