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Finding the Fourth Proportional to 813.50, 1,122.35 and 459.38

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Solution

The fourth proportional to 813.50, 1,122.35 and 459.38 is: 633.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.50 : 1,122.35 = 459.38 : x
  2. Step 2: Convert to fraction form
    813.50/1,122.35 = 459.38/x
  3. Step 3: Cross multiply
    813.50x = 1,122.35 × 459.38
  4. Step 4: Simplify right side
    813.50x = 515,577.23
  5. Step 5: Solve for x
    x = 515,577.23/813.50
  6. Step 6: Final answer
    x = 633.78

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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.