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Finding the Fourth Proportional to 57.68, 79.51 and 49.76

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Solution

The fourth proportional to 57.68, 79.51 and 49.76 is: 68.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.68 : 79.51 = 49.76 : x
  2. Step 2: Convert to fraction form
    57.68/79.51 = 49.76/x
  3. Step 3: Cross multiply
    57.68x = 79.51 × 49.76
  4. Step 4: Simplify right side
    57.68x = 3,955.77
  5. Step 5: Solve for x
    x = 3,955.77/57.68
  6. Step 6: Final answer
    x = 68.58

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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.