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Finding the Fourth Proportional to 71.68, 106.83 and 57.91

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Solution

The fourth proportional to 71.68, 106.83 and 57.91 is: 86.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.68 : 106.83 = 57.91 : x
  2. Step 2: Convert to fraction form
    71.68/106.83 = 57.91/x
  3. Step 3: Cross multiply
    71.68x = 106.83 × 57.91
  4. Step 4: Simplify right side
    71.68x = 6,186.53
  5. Step 5: Solve for x
    x = 6,186.53/71.68
  6. Step 6: Final answer
    x = 86.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.