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Finding the Fourth Proportional to 39.13, 58.70 and 19.88

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Solution

The fourth proportional to 39.13, 58.70 and 19.88 is: 29.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.13 : 58.70 = 19.88 : x
  2. Step 2: Convert to fraction form
    39.13/58.70 = 19.88/x
  3. Step 3: Cross multiply
    39.13x = 58.70 × 19.88
  4. Step 4: Simplify right side
    39.13x = 1,166.71
  5. Step 5: Solve for x
    x = 1,166.71/39.13
  6. Step 6: Final answer
    x = 29.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.