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Finding the Fourth Proportional to 58.79, 81.11 and 39.42

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Solution

The fourth proportional to 58.79, 81.11 and 39.42 is: 54.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.79 : 81.11 = 39.42 : x
  2. Step 2: Convert to fraction form
    58.79/81.11 = 39.42/x
  3. Step 3: Cross multiply
    58.79x = 81.11 × 39.42
  4. Step 4: Simplify right side
    58.79x = 3,197.45
  5. Step 5: Solve for x
    x = 3,197.45/58.79
  6. Step 6: Final answer
    x = 54.39

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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.