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Finding the Fourth Proportional to 1,248.26, 1,722.65 and 688.76

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Solution

The fourth proportional to 1,248.26, 1,722.65 and 688.76 is: 950.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.26 : 1,722.65 = 688.76 : x
  2. Step 2: Convert to fraction form
    1,248.26/1,722.65 = 688.76/x
  3. Step 3: Cross multiply
    1,248.26x = 1,722.65 × 688.76
  4. Step 4: Simplify right side
    1,248.26x = 1,186,480.36
  5. Step 5: Solve for x
    x = 1,186,480.36/1,248.26
  6. Step 6: Final answer
    x = 950.51

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1.5x scale

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.