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Finding the Fourth Proportional to 60.50, 90.72 and 31.20

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Solution

The fourth proportional to 60.50, 90.72 and 31.20 is: 46.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.50 : 90.72 = 31.20 : x
  2. Step 2: Convert to fraction form
    60.50/90.72 = 31.20/x
  3. Step 3: Cross multiply
    60.50x = 90.72 × 31.20
  4. Step 4: Simplify right side
    60.50x = 2,830.46
  5. Step 5: Solve for x
    x = 2,830.46/60.50
  6. Step 6: Final answer
    x = 46.78

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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.