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Finding the Fourth Proportional to 61.24, 91.48 and 45.24

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Solution

The fourth proportional to 61.24, 91.48 and 45.24 is: 67.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.24 : 91.48 = 45.24 : x
  2. Step 2: Convert to fraction form
    61.24/91.48 = 45.24/x
  3. Step 3: Cross multiply
    61.24x = 91.48 × 45.24
  4. Step 4: Simplify right side
    61.24x = 4,138.56
  5. Step 5: Solve for x
    x = 4,138.56/61.24
  6. Step 6: Final answer
    x = 67.58

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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.