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Finding the Fourth Proportional to 57.45, 79.20 and 49.66

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Solution

The fourth proportional to 57.45, 79.20 and 49.66 is: 68.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.45 : 79.20 = 49.66 : x
  2. Step 2: Convert to fraction form
    57.45/79.20 = 49.66/x
  3. Step 3: Cross multiply
    57.45x = 79.20 × 49.66
  4. Step 4: Simplify right side
    57.45x = 3,933.36
  5. Step 5: Solve for x
    x = 3,933.36/57.45
  6. Step 6: Final answer
    x = 68.47

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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.