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Finding the Fourth Proportional to 1,247.89, 1,871.37 and 425.94

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Solution

The fourth proportional to 1,247.89, 1,871.37 and 425.94 is: 638.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.89 : 1,871.37 = 425.94 : x
  2. Step 2: Convert to fraction form
    1,247.89/1,871.37 = 425.94/x
  3. Step 3: Cross multiply
    1,247.89x = 1,871.37 × 425.94
  4. Step 4: Simplify right side
    1,247.89x = 797,091.34
  5. Step 5: Solve for x
    x = 797,091.34/1,247.89
  6. Step 6: Final answer
    x = 638.75

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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.