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Finding the Fourth Proportional to 66.40, 91.48 and 58.16

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Solution

The fourth proportional to 66.40, 91.48 and 58.16 is: 80.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.40 : 91.48 = 58.16 : x
  2. Step 2: Convert to fraction form
    66.40/91.48 = 58.16/x
  3. Step 3: Cross multiply
    66.40x = 91.48 × 58.16
  4. Step 4: Simplify right side
    66.40x = 5,320.48
  5. Step 5: Solve for x
    x = 5,320.48/66.40
  6. Step 6: Final answer
    x = 80.13

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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.