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Finding the Fourth Proportional to 1,315.59, 1,816.17 and 818.39

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Solution

The fourth proportional to 1,315.59, 1,816.17 and 818.39 is: 1,129.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.59 : 1,816.17 = 818.39 : x
  2. Step 2: Convert to fraction form
    1,315.59/1,816.17 = 818.39/x
  3. Step 3: Cross multiply
    1,315.59x = 1,816.17 × 818.39
  4. Step 4: Simplify right side
    1,315.59x = 1,486,322.19
  5. Step 5: Solve for x
    x = 1,486,322.19/1,315.59
  6. Step 6: Final answer
    x = 1,129.78

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Double scale
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Similar ratio
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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.