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Finding the Fourth Proportional to 60.72, 83.79 and 38.90

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Solution

The fourth proportional to 60.72, 83.79 and 38.90 is: 53.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.72 : 83.79 = 38.90 : x
  2. Step 2: Convert to fraction form
    60.72/83.79 = 38.90/x
  3. Step 3: Cross multiply
    60.72x = 83.79 × 38.90
  4. Step 4: Simplify right side
    60.72x = 3,259.01
  5. Step 5: Solve for x
    x = 3,259.01/60.72
  6. Step 6: Final answer
    x = 53.67

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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.