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Finding the Fourth Proportional to 49.69, 68.40 and 42.87

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Solution

The fourth proportional to 49.69, 68.40 and 42.87 is: 59.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.69 : 68.40 = 42.87 : x
  2. Step 2: Convert to fraction form
    49.69/68.40 = 42.87/x
  3. Step 3: Cross multiply
    49.69x = 68.40 × 42.87
  4. Step 4: Simplify right side
    49.69x = 2,932.31
  5. Step 5: Solve for x
    x = 2,932.31/49.69
  6. Step 6: Final answer
    x = 59.01

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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.