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Finding the Fourth Proportional to 813.19, 1,122.13 and 459.20

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Solution

The fourth proportional to 813.19, 1,122.13 and 459.20 is: 633.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.19 : 1,122.13 = 459.20 : x
  2. Step 2: Convert to fraction form
    813.19/1,122.13 = 459.20/x
  3. Step 3: Cross multiply
    813.19x = 1,122.13 × 459.20
  4. Step 4: Simplify right side
    813.19x = 515,282.10
  5. Step 5: Solve for x
    x = 515,282.10/813.19
  6. Step 6: Final answer
    x = 633.66

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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.