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Finding the Fourth Proportional to 1,248.67, 1,871.42 and 663.95

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Solution

The fourth proportional to 1,248.67, 1,871.42 and 663.95 is: 995.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.67 : 1,871.42 = 663.95 : x
  2. Step 2: Convert to fraction form
    1,248.67/1,871.42 = 663.95/x
  3. Step 3: Cross multiply
    1,248.67x = 1,871.42 × 663.95
  4. Step 4: Simplify right side
    1,248.67x = 1,242,537.98
  5. Step 5: Solve for x
    x = 1,242,537.98/1,248.67
  6. Step 6: Final answer
    x = 995.09

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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.