Home / 1,291.24-1,781.38-766.76

Finding the Fourth Proportional to 1,291.24, 1,781.38 and 766.76

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Solution

The fourth proportional to 1,291.24, 1,781.38 and 766.76 is: 1,057.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.24 : 1,781.38 = 766.76 : x
  2. Step 2: Convert to fraction form
    1,291.24/1,781.38 = 766.76/x
  3. Step 3: Cross multiply
    1,291.24x = 1,781.38 × 766.76
  4. Step 4: Simplify right side
    1,291.24x = 1,365,890.93
  5. Step 5: Solve for x
    x = 1,365,890.93/1,291.24
  6. Step 6: Final answer
    x = 1,057.81

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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.