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Finding the Fourth Proportional to 66.06, 91.08 and 57.29

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Solution

The fourth proportional to 66.06, 91.08 and 57.29 is: 78.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.06 : 91.08 = 57.29 : x
  2. Step 2: Convert to fraction form
    66.06/91.08 = 57.29/x
  3. Step 3: Cross multiply
    66.06x = 91.08 × 57.29
  4. Step 4: Simplify right side
    66.06x = 5,217.52
  5. Step 5: Solve for x
    x = 5,217.52/66.06
  6. Step 6: Final answer
    x = 78.98

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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.