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Finding the Fourth Proportional to 61.20, 83.94 and 58.38

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Solution

The fourth proportional to 61.20, 83.94 and 58.38 is: 80.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.20 : 83.94 = 58.38 : x
  2. Step 2: Convert to fraction form
    61.20/83.94 = 58.38/x
  3. Step 3: Cross multiply
    61.20x = 83.94 × 58.38
  4. Step 4: Simplify right side
    61.20x = 4,900.42
  5. Step 5: Solve for x
    x = 4,900.42/61.20
  6. Step 6: Final answer
    x = 80.07

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.