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Finding the Fourth Proportional to 1,291.19, 1,781.82 and 767.18

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Solution

The fourth proportional to 1,291.19, 1,781.82 and 767.18 is: 1,058.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.19 : 1,781.82 = 767.18 : x
  2. Step 2: Convert to fraction form
    1,291.19/1,781.82 = 767.18/x
  3. Step 3: Cross multiply
    1,291.19x = 1,781.82 × 767.18
  4. Step 4: Simplify right side
    1,291.19x = 1,366,976.67
  5. Step 5: Solve for x
    x = 1,366,976.67/1,291.19
  6. Step 6: Final answer
    x = 1,058.70

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Half scale
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Double scale
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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.