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Finding the Fourth Proportional to 61.99, 85.57 and 48.20

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Solution

The fourth proportional to 61.99, 85.57 and 48.20 is: 66.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.99 : 85.57 = 48.20 : x
  2. Step 2: Convert to fraction form
    61.99/85.57 = 48.20/x
  3. Step 3: Cross multiply
    61.99x = 85.57 × 48.20
  4. Step 4: Simplify right side
    61.99x = 4,123.93
  5. Step 5: Solve for x
    x = 4,123.93/61.99
  6. Step 6: Final answer
    x = 66.53

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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.