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Finding the Fourth Proportional to 1,248.11, 1,722.40 and 688.56

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Solution

The fourth proportional to 1,248.11, 1,722.40 and 688.56 is: 950.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.11 : 1,722.40 = 688.56 : x
  2. Step 2: Convert to fraction form
    1,248.11/1,722.40 = 688.56/x
  3. Step 3: Cross multiply
    1,248.11x = 1,722.40 × 688.56
  4. Step 4: Simplify right side
    1,248.11x = 1,185,972.41
  5. Step 5: Solve for x
    x = 1,185,972.41/1,248.11
  6. Step 6: Final answer
    x = 950.22

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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.