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Finding the Fourth Proportional to 1,049.56, 1,574.22 and 280

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Solution

The fourth proportional to 1,049.56, 1,574.22 and 280 is: 419.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.56 : 1,574.22 = 280 : x
  2. Step 2: Convert to fraction form
    1,049.56/1,574.22 = 280/x
  3. Step 3: Cross multiply
    1,049.56x = 1,574.22 × 280
  4. Step 4: Simplify right side
    1,049.56x = 440,781.60
  5. Step 5: Solve for x
    x = 440,781.60/1,049.56
  6. Step 6: Final answer
    x = 419.97

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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.