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Finding the Fourth Proportional to 77.18, 115.68 and 53.16

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Solution

The fourth proportional to 77.18, 115.68 and 53.16 is: 79.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.18 : 115.68 = 53.16 : x
  2. Step 2: Convert to fraction form
    77.18/115.68 = 53.16/x
  3. Step 3: Cross multiply
    77.18x = 115.68 × 53.16
  4. Step 4: Simplify right side
    77.18x = 6,149.55
  5. Step 5: Solve for x
    x = 6,149.55/77.18
  6. Step 6: Final answer
    x = 79.68

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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.