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Finding the Fourth Proportional to 76.07, 113.95 and 39.91

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Solution

The fourth proportional to 76.07, 113.95 and 39.91 is: 59.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.07 : 113.95 = 39.91 : x
  2. Step 2: Convert to fraction form
    76.07/113.95 = 39.91/x
  3. Step 3: Cross multiply
    76.07x = 113.95 × 39.91
  4. Step 4: Simplify right side
    76.07x = 4,547.46
  5. Step 5: Solve for x
    x = 4,547.46/76.07
  6. Step 6: Final answer
    x = 59.78

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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.