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Finding the Fourth Proportional to 58.74, 81 and 39.30

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Solution

The fourth proportional to 58.74, 81 and 39.30 is: 54.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.74 : 81 = 39.30 : x
  2. Step 2: Convert to fraction form
    58.74/81 = 39.30/x
  3. Step 3: Cross multiply
    58.74x = 81 × 39.30
  4. Step 4: Simplify right side
    58.74x = 3,183.30
  5. Step 5: Solve for x
    x = 3,183.30/58.74
  6. Step 6: Final answer
    x = 54.19

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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.