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Finding the Fourth Proportional to 72.66, 108.87 and 53.19

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Solution

The fourth proportional to 72.66, 108.87 and 53.19 is: 79.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.66 : 108.87 = 53.19 : x
  2. Step 2: Convert to fraction form
    72.66/108.87 = 53.19/x
  3. Step 3: Cross multiply
    72.66x = 108.87 × 53.19
  4. Step 4: Simplify right side
    72.66x = 5,790.80
  5. Step 5: Solve for x
    x = 5,790.80/72.66
  6. Step 6: Final answer
    x = 79.70

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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.