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Finding the Fourth Proportional to 66.41, 91.51 and 57.16

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Solution

The fourth proportional to 66.41, 91.51 and 57.16 is: 78.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.41 : 91.51 = 57.16 : x
  2. Step 2: Convert to fraction form
    66.41/91.51 = 57.16/x
  3. Step 3: Cross multiply
    66.41x = 91.51 × 57.16
  4. Step 4: Simplify right side
    66.41x = 5,230.34
  5. Step 5: Solve for x
    x = 5,230.34/66.41
  6. Step 6: Final answer
    x = 78.76

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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.