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Finding the Fourth Proportional to 49.60, 74.12 and 40

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Solution

The fourth proportional to 49.60, 74.12 and 40 is: 59.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.60 : 74.12 = 40 : x
  2. Step 2: Convert to fraction form
    49.60/74.12 = 40/x
  3. Step 3: Cross multiply
    49.60x = 74.12 × 40
  4. Step 4: Simplify right side
    49.60x = 2,964.80
  5. Step 5: Solve for x
    x = 2,964.80/49.60
  6. Step 6: Final answer
    x = 59.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.