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Finding the Fourth Proportional to 71.33, 106.86 and 56.91

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Solution

The fourth proportional to 71.33, 106.86 and 56.91 is: 85.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.33 : 106.86 = 56.91 : x
  2. Step 2: Convert to fraction form
    71.33/106.86 = 56.91/x
  3. Step 3: Cross multiply
    71.33x = 106.86 × 56.91
  4. Step 4: Simplify right side
    71.33x = 6,081.40
  5. Step 5: Solve for x
    x = 6,081.40/71.33
  6. Step 6: Final answer
    x = 85.26

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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.