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Finding the Fourth Proportional to 1,248.90, 1,722.78 and 724.86

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Solution

The fourth proportional to 1,248.90, 1,722.78 and 724.86 is: 999.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.90 : 1,722.78 = 724.86 : x
  2. Step 2: Convert to fraction form
    1,248.90/1,722.78 = 724.86/x
  3. Step 3: Cross multiply
    1,248.90x = 1,722.78 × 724.86
  4. Step 4: Simplify right side
    1,248.90x = 1,248,774.31
  5. Step 5: Solve for x
    x = 1,248,774.31/1,248.90
  6. Step 6: Final answer
    x = 999.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.