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Finding the Fourth Proportional to 813.07, 1,217.40 and 422.25

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Solution

The fourth proportional to 813.07, 1,217.40 and 422.25 is: 632.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.07 : 1,217.40 = 422.25 : x
  2. Step 2: Convert to fraction form
    813.07/1,217.40 = 422.25/x
  3. Step 3: Cross multiply
    813.07x = 1,217.40 × 422.25
  4. Step 4: Simplify right side
    813.07x = 514,047.15
  5. Step 5: Solve for x
    x = 514,047.15/813.07
  6. Step 6: Final answer
    x = 632.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.