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Finding the Fourth Proportional to 57.30, 79.10 and 38.89

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Solution

The fourth proportional to 57.30, 79.10 and 38.89 is: 53.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.30 : 79.10 = 38.89 : x
  2. Step 2: Convert to fraction form
    57.30/79.10 = 38.89/x
  3. Step 3: Cross multiply
    57.30x = 79.10 × 38.89
  4. Step 4: Simplify right side
    57.30x = 3,076.10
  5. Step 5: Solve for x
    x = 3,076.10/57.30
  6. Step 6: Final answer
    x = 53.68

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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.