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Finding the Fourth Proportional to 42.30, 58.41 and 27.81

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Solution

The fourth proportional to 42.30, 58.41 and 27.81 is: 38.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.30 : 58.41 = 27.81 : x
  2. Step 2: Convert to fraction form
    42.30/58.41 = 27.81/x
  3. Step 3: Cross multiply
    42.30x = 58.41 × 27.81
  4. Step 4: Simplify right side
    42.30x = 1,624.38
  5. Step 5: Solve for x
    x = 1,624.38/42.30
  6. Step 6: Final answer
    x = 38.40

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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.