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Finding the Fourth Proportional to 1,131.68, 1,560.84 and 818.12

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Solution

The fourth proportional to 1,131.68, 1,560.84 and 818.12 is: 1,128.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.68 : 1,560.84 = 818.12 : x
  2. Step 2: Convert to fraction form
    1,131.68/1,560.84 = 818.12/x
  3. Step 3: Cross multiply
    1,131.68x = 1,560.84 × 818.12
  4. Step 4: Simplify right side
    1,131.68x = 1,276,954.42
  5. Step 5: Solve for x
    x = 1,276,954.42/1,131.68
  6. Step 6: Final answer
    x = 1,128.37

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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.