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Finding the Fourth Proportional to 49.13, 73.53 and 42.78

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Solution

The fourth proportional to 49.13, 73.53 and 42.78 is: 64.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.13 : 73.53 = 42.78 : x
  2. Step 2: Convert to fraction form
    49.13/73.53 = 42.78/x
  3. Step 3: Cross multiply
    49.13x = 73.53 × 42.78
  4. Step 4: Simplify right side
    49.13x = 3,145.58
  5. Step 5: Solve for x
    x = 3,145.58/49.13
  6. Step 6: Final answer
    x = 64.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.