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Finding the Fourth Proportional to 58.15, 80.17 and 48.90

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Solution

The fourth proportional to 58.15, 80.17 and 48.90 is: 67.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.15 : 80.17 = 48.90 : x
  2. Step 2: Convert to fraction form
    58.15/80.17 = 48.90/x
  3. Step 3: Cross multiply
    58.15x = 80.17 × 48.90
  4. Step 4: Simplify right side
    58.15x = 3,920.31
  5. Step 5: Solve for x
    x = 3,920.31/58.15
  6. Step 6: Final answer
    x = 67.42

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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.