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Finding the Fourth Proportional to 76.91, 115.01 and 56.41

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Solution

The fourth proportional to 76.91, 115.01 and 56.41 is: 84.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.91 : 115.01 = 56.41 : x
  2. Step 2: Convert to fraction form
    76.91/115.01 = 56.41/x
  3. Step 3: Cross multiply
    76.91x = 115.01 × 56.41
  4. Step 4: Simplify right side
    76.91x = 6,487.36
  5. Step 5: Solve for x
    x = 6,487.36/76.91
  6. Step 6: Final answer
    x = 84.36

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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.