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Finding the Fourth Proportional to 1,248.42, 1,722.81 and 717.33

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Solution

The fourth proportional to 1,248.42, 1,722.81 and 717.33 is: 989.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.42 : 1,722.81 = 717.33 : x
  2. Step 2: Convert to fraction form
    1,248.42/1,722.81 = 717.33/x
  3. Step 3: Cross multiply
    1,248.42x = 1,722.81 × 717.33
  4. Step 4: Simplify right side
    1,248.42x = 1,235,832.45
  5. Step 5: Solve for x
    x = 1,235,832.45/1,248.42
  6. Step 6: Final answer
    x = 989.91

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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.