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Finding the Fourth Proportional to 77.65, 116.50 and 31.38

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Solution

The fourth proportional to 77.65, 116.50 and 31.38 is: 47.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.65 : 116.50 = 31.38 : x
  2. Step 2: Convert to fraction form
    77.65/116.50 = 31.38/x
  3. Step 3: Cross multiply
    77.65x = 116.50 × 31.38
  4. Step 4: Simplify right side
    77.65x = 3,655.69
  5. Step 5: Solve for x
    x = 3,655.69/77.65
  6. Step 6: Final answer
    x = 47.08

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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.