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Finding the Fourth Proportional to 57.43, 79.15 and 49.63

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Solution

The fourth proportional to 57.43, 79.15 and 49.63 is: 68.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.43 : 79.15 = 49.63 : x
  2. Step 2: Convert to fraction form
    57.43/79.15 = 49.63/x
  3. Step 3: Cross multiply
    57.43x = 79.15 × 49.63
  4. Step 4: Simplify right side
    57.43x = 3,928.21
  5. Step 5: Solve for x
    x = 3,928.21/57.43
  6. Step 6: Final answer
    x = 68.40

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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.