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Finding the Fourth Proportional to 60.70, 91.11 and 53.20

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Solution

The fourth proportional to 60.70, 91.11 and 53.20 is: 79.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.70 : 91.11 = 53.20 : x
  2. Step 2: Convert to fraction form
    60.70/91.11 = 53.20/x
  3. Step 3: Cross multiply
    60.70x = 91.11 × 53.20
  4. Step 4: Simplify right side
    60.70x = 4,847.05
  5. Step 5: Solve for x
    x = 4,847.05/60.70
  6. Step 6: Final answer
    x = 79.85

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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.