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Finding the Fourth Proportional to 71.21, 98.21 and 58.91

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Solution

The fourth proportional to 71.21, 98.21 and 58.91 is: 81.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.21 : 98.21 = 58.91 : x
  2. Step 2: Convert to fraction form
    71.21/98.21 = 58.91/x
  3. Step 3: Cross multiply
    71.21x = 98.21 × 58.91
  4. Step 4: Simplify right side
    71.21x = 5,785.13
  5. Step 5: Solve for x
    x = 5,785.13/71.21
  6. Step 6: Final answer
    x = 81.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.