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Finding the Fourth Proportional to 58.98, 81.38 and 39.58

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Solution

The fourth proportional to 58.98, 81.38 and 39.58 is: 54.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.98 : 81.38 = 39.58 : x
  2. Step 2: Convert to fraction form
    58.98/81.38 = 39.58/x
  3. Step 3: Cross multiply
    58.98x = 81.38 × 39.58
  4. Step 4: Simplify right side
    58.98x = 3,221.02
  5. Step 5: Solve for x
    x = 3,221.02/58.98
  6. Step 6: Final answer
    x = 54.61

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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.