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Finding the Fourth Proportional to 1,290.92, 1,781.46 and 767.06

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Solution

The fourth proportional to 1,290.92, 1,781.46 and 767.06 is: 1,058.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.92 : 1,781.46 = 767.06 : x
  2. Step 2: Convert to fraction form
    1,290.92/1,781.46 = 767.06/x
  3. Step 3: Cross multiply
    1,290.92x = 1,781.46 × 767.06
  4. Step 4: Simplify right side
    1,290.92x = 1,366,486.71
  5. Step 5: Solve for x
    x = 1,366,486.71/1,290.92
  6. Step 6: Final answer
    x = 1,058.54

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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.