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Finding the Fourth Proportional to 60.19, 90.20 and 39.85

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Solution

The fourth proportional to 60.19, 90.20 and 39.85 is: 59.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.19 : 90.20 = 39.85 : x
  2. Step 2: Convert to fraction form
    60.19/90.20 = 39.85/x
  3. Step 3: Cross multiply
    60.19x = 90.20 × 39.85
  4. Step 4: Simplify right side
    60.19x = 3,594.27
  5. Step 5: Solve for x
    x = 3,594.27/60.19
  6. Step 6: Final answer
    x = 59.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.