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Finding the Fourth Proportional to 1,290.48, 1,781.28 and 759.33

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Solution

The fourth proportional to 1,290.48, 1,781.28 and 759.33 is: 1,048.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.48 : 1,781.28 = 759.33 : x
  2. Step 2: Convert to fraction form
    1,290.48/1,781.28 = 759.33/x
  3. Step 3: Cross multiply
    1,290.48x = 1,781.28 × 759.33
  4. Step 4: Simplify right side
    1,290.48x = 1,352,576.49
  5. Step 5: Solve for x
    x = 1,352,576.49/1,290.48
  6. Step 6: Final answer
    x = 1,048.12

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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.