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Finding the Fourth Proportional to 1,049.85, 1,574.78 and 639.79

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Solution

The fourth proportional to 1,049.85, 1,574.78 and 639.79 is: 959.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.85 : 1,574.78 = 639.79 : x
  2. Step 2: Convert to fraction form
    1,049.85/1,574.78 = 639.79/x
  3. Step 3: Cross multiply
    1,049.85x = 1,574.78 × 639.79
  4. Step 4: Simplify right side
    1,049.85x = 1,007,521.36
  5. Step 5: Solve for x
    x = 1,007,521.36/1,049.85
  6. Step 6: Final answer
    x = 959.68

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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.