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Finding the Fourth Proportional to 71.21, 98.18 and 58.05

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Solution

The fourth proportional to 71.21, 98.18 and 58.05 is: 80.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.21 : 98.18 = 58.05 : x
  2. Step 2: Convert to fraction form
    71.21/98.18 = 58.05/x
  3. Step 3: Cross multiply
    71.21x = 98.18 × 58.05
  4. Step 4: Simplify right side
    71.21x = 5,699.35
  5. Step 5: Solve for x
    x = 5,699.35/71.21
  6. Step 6: Final answer
    x = 80.04

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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.