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Finding the Fourth Proportional to 39.33, 58.70 and 34.78

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Solution

The fourth proportional to 39.33, 58.70 and 34.78 is: 51.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.33 : 58.70 = 34.78 : x
  2. Step 2: Convert to fraction form
    39.33/58.70 = 34.78/x
  3. Step 3: Cross multiply
    39.33x = 58.70 × 34.78
  4. Step 4: Simplify right side
    39.33x = 2,041.59
  5. Step 5: Solve for x
    x = 2,041.59/39.33
  6. Step 6: Final answer
    x = 51.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.