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Finding the Fourth Proportional to 49.76, 68.72 and 40

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Solution

The fourth proportional to 49.76, 68.72 and 40 is: 55.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.76 : 68.72 = 40 : x
  2. Step 2: Convert to fraction form
    49.76/68.72 = 40/x
  3. Step 3: Cross multiply
    49.76x = 68.72 × 40
  4. Step 4: Simplify right side
    49.76x = 2,748.80
  5. Step 5: Solve for x
    x = 2,748.80/49.76
  6. Step 6: Final answer
    x = 55.24

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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.