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Finding the Fourth Proportional to 1,247.76, 1,871.75 and 425.70

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Solution

The fourth proportional to 1,247.76, 1,871.75 and 425.70 is: 638.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.76 : 1,871.75 = 425.70 : x
  2. Step 2: Convert to fraction form
    1,247.76/1,871.75 = 425.70/x
  3. Step 3: Cross multiply
    1,247.76x = 1,871.75 × 425.70
  4. Step 4: Simplify right side
    1,247.76x = 796,801.85
  5. Step 5: Solve for x
    x = 796,801.85/1,247.76
  6. Step 6: Final answer
    x = 638.59

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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.