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Finding the Fourth Proportional to 39.18, 58.40 and 38.77

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Solution

The fourth proportional to 39.18, 58.40 and 38.77 is: 57.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.18 : 58.40 = 38.77 : x
  2. Step 2: Convert to fraction form
    39.18/58.40 = 38.77/x
  3. Step 3: Cross multiply
    39.18x = 58.40 × 38.77
  4. Step 4: Simplify right side
    39.18x = 2,264.17
  5. Step 5: Solve for x
    x = 2,264.17/39.18
  6. Step 6: Final answer
    x = 57.79

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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.