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Finding the Fourth Proportional to 817.28, 1,226.70 and 611.24

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Solution

The fourth proportional to 817.28, 1,226.70 and 611.24 is: 917.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.28 : 1,226.70 = 611.24 : x
  2. Step 2: Convert to fraction form
    817.28/1,226.70 = 611.24/x
  3. Step 3: Cross multiply
    817.28x = 1,226.70 × 611.24
  4. Step 4: Simplify right side
    817.28x = 749,808.11
  5. Step 5: Solve for x
    x = 749,808.11/817.28
  6. Step 6: Final answer
    x = 917.44

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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.