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Finding the Fourth Proportional to 59.15, 81.68 and 58.21

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Solution

The fourth proportional to 59.15, 81.68 and 58.21 is: 80.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.15 : 81.68 = 58.21 : x
  2. Step 2: Convert to fraction form
    59.15/81.68 = 58.21/x
  3. Step 3: Cross multiply
    59.15x = 81.68 × 58.21
  4. Step 4: Simplify right side
    59.15x = 4,754.10
  5. Step 5: Solve for x
    x = 4,754.10/59.15
  6. Step 6: Final answer
    x = 80.37

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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.