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Finding the Fourth Proportional to 57.65, 79.38 and 49.28

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Solution

The fourth proportional to 57.65, 79.38 and 49.28 is: 67.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.65 : 79.38 = 49.28 : x
  2. Step 2: Convert to fraction form
    57.65/79.38 = 49.28/x
  3. Step 3: Cross multiply
    57.65x = 79.38 × 49.28
  4. Step 4: Simplify right side
    57.65x = 3,911.45
  5. Step 5: Solve for x
    x = 3,911.45/57.65
  6. Step 6: Final answer
    x = 67.85

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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.