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Finding the Fourth Proportional to 66.24, 91.36 and 48.96

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Solution

The fourth proportional to 66.24, 91.36 and 48.96 is: 67.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.24 : 91.36 = 48.96 : x
  2. Step 2: Convert to fraction form
    66.24/91.36 = 48.96/x
  3. Step 3: Cross multiply
    66.24x = 91.36 × 48.96
  4. Step 4: Simplify right side
    66.24x = 4,472.99
  5. Step 5: Solve for x
    x = 4,472.99/66.24
  6. Step 6: Final answer
    x = 67.53

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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.