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Finding the Fourth Proportional to 817.10, 1,223.49 and 431.54

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Solution

The fourth proportional to 817.10, 1,223.49 and 431.54 is: 646.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.10 : 1,223.49 = 431.54 : x
  2. Step 2: Convert to fraction form
    817.10/1,223.49 = 431.54/x
  3. Step 3: Cross multiply
    817.10x = 1,223.49 × 431.54
  4. Step 4: Simplify right side
    817.10x = 527,984.87
  5. Step 5: Solve for x
    x = 527,984.87/817.10
  6. Step 6: Final answer
    x = 646.17

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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.