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Finding the Fourth Proportional to 816.30, 1,223.19 and 609.90

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Solution

The fourth proportional to 816.30, 1,223.19 and 609.90 is: 913.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.30 : 1,223.19 = 609.90 : x
  2. Step 2: Convert to fraction form
    816.30/1,223.19 = 609.90/x
  3. Step 3: Cross multiply
    816.30x = 1,223.19 × 609.90
  4. Step 4: Simplify right side
    816.30x = 746,023.58
  5. Step 5: Solve for x
    x = 746,023.58/816.30
  6. Step 6: Final answer
    x = 913.91

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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.