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Finding the Fourth Proportional to 66.31, 91.49 and 40.10

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Solution

The fourth proportional to 66.31, 91.49 and 40.10 is: 55.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.31 : 91.49 = 40.10 : x
  2. Step 2: Convert to fraction form
    66.31/91.49 = 40.10/x
  3. Step 3: Cross multiply
    66.31x = 91.49 × 40.10
  4. Step 4: Simplify right side
    66.31x = 3,668.32
  5. Step 5: Solve for x
    x = 3,668.32/66.31
  6. Step 6: Final answer
    x = 55.32

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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.