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Finding the Fourth Proportional to 813.89, 1,123.19 and 459.81

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Solution

The fourth proportional to 813.89, 1,123.19 and 459.81 is: 634.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.89 : 1,123.19 = 459.81 : x
  2. Step 2: Convert to fraction form
    813.89/1,123.19 = 459.81/x
  3. Step 3: Cross multiply
    813.89x = 1,123.19 × 459.81
  4. Step 4: Simplify right side
    813.89x = 516,451.69
  5. Step 5: Solve for x
    x = 516,451.69/813.89
  6. Step 6: Final answer
    x = 634.55

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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.