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Finding the Fourth Proportional to 1,247.69, 1,871.69 and 425.74

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Solution

The fourth proportional to 1,247.69, 1,871.69 and 425.74 is: 638.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.69 : 1,871.69 = 425.74 : x
  2. Step 2: Convert to fraction form
    1,247.69/1,871.69 = 425.74/x
  3. Step 3: Cross multiply
    1,247.69x = 1,871.69 × 425.74
  4. Step 4: Simplify right side
    1,247.69x = 796,853.30
  5. Step 5: Solve for x
    x = 796,853.30/1,247.69
  6. Step 6: Final answer
    x = 638.66

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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.