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Finding the Fourth Proportional to 1,248.74, 1,871.08 and 663.70

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Solution

The fourth proportional to 1,248.74, 1,871.08 and 663.70 is: 994.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.74 : 1,871.08 = 663.70 : x
  2. Step 2: Convert to fraction form
    1,248.74/1,871.08 = 663.70/x
  3. Step 3: Cross multiply
    1,248.74x = 1,871.08 × 663.70
  4. Step 4: Simplify right side
    1,248.74x = 1,241,835.80
  5. Step 5: Solve for x
    x = 1,241,835.80/1,248.74
  6. Step 6: Final answer
    x = 994.47

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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.