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Finding the Fourth Proportional to 1,290.92, 1,781.34 and 731.38

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Solution

The fourth proportional to 1,290.92, 1,781.34 and 731.38 is: 1,009.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.92 : 1,781.34 = 731.38 : x
  2. Step 2: Convert to fraction form
    1,290.92/1,781.34 = 731.38/x
  3. Step 3: Cross multiply
    1,290.92x = 1,781.34 × 731.38
  4. Step 4: Simplify right side
    1,290.92x = 1,302,836.45
  5. Step 5: Solve for x
    x = 1,302,836.45/1,290.92
  6. Step 6: Final answer
    x = 1,009.23

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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.