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Finding the Fourth Proportional to 1,248.33, 1,722.68 and 688.80

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Solution

The fourth proportional to 1,248.33, 1,722.68 and 688.80 is: 950.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.33 : 1,722.68 = 688.80 : x
  2. Step 2: Convert to fraction form
    1,248.33/1,722.68 = 688.80/x
  3. Step 3: Cross multiply
    1,248.33x = 1,722.68 × 688.80
  4. Step 4: Simplify right side
    1,248.33x = 1,186,591.46
  5. Step 5: Solve for x
    x = 1,186,591.46/1,248.33
  6. Step 6: Final answer
    x = 950.54

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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.