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Finding the Fourth Proportional to 61.25, 91.20 and 60.40

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Solution

The fourth proportional to 61.25, 91.20 and 60.40 is: 89.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.25 : 91.20 = 60.40 : x
  2. Step 2: Convert to fraction form
    61.25/91.20 = 60.40/x
  3. Step 3: Cross multiply
    61.25x = 91.20 × 60.40
  4. Step 4: Simplify right side
    61.25x = 5,508.48
  5. Step 5: Solve for x
    x = 5,508.48/61.25
  6. Step 6: Final answer
    x = 89.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.