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Finding the Fourth Proportional to 1,291.53, 1,781.68 and 767.19

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Solution

The fourth proportional to 1,291.53, 1,781.68 and 767.19 is: 1,058.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.53 : 1,781.68 = 767.19 : x
  2. Step 2: Convert to fraction form
    1,291.53/1,781.68 = 767.19/x
  3. Step 3: Cross multiply
    1,291.53x = 1,781.68 × 767.19
  4. Step 4: Simplify right side
    1,291.53x = 1,366,887.08
  5. Step 5: Solve for x
    x = 1,366,887.08/1,291.53
  6. Step 6: Final answer
    x = 1,058.35

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Half scale
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Double scale
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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.