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Finding the Fourth Proportional to 1,248.20, 1,722.41 and 688.65

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Solution

The fourth proportional to 1,248.20, 1,722.41 and 688.65 is: 950.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.20 : 1,722.41 = 688.65 : x
  2. Step 2: Convert to fraction form
    1,248.20/1,722.41 = 688.65/x
  3. Step 3: Cross multiply
    1,248.20x = 1,722.41 × 688.65
  4. Step 4: Simplify right side
    1,248.20x = 1,186,137.65
  5. Step 5: Solve for x
    x = 1,186,137.65/1,248.20
  6. Step 6: Final answer
    x = 950.28

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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.