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Finding the Fourth Proportional to 1,049.49, 1,574.81 and 638.91

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Solution

The fourth proportional to 1,049.49, 1,574.81 and 638.91 is: 958.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.49 : 1,574.81 = 638.91 : x
  2. Step 2: Convert to fraction form
    1,049.49/1,574.81 = 638.91/x
  3. Step 3: Cross multiply
    1,049.49x = 1,574.81 × 638.91
  4. Step 4: Simplify right side
    1,049.49x = 1,006,158.66
  5. Step 5: Solve for x
    x = 1,006,158.66/1,049.49
  6. Step 6: Final answer
    x = 958.71

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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.