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Finding the Fourth Proportional to 817.75, 1,128.43 and 463.67

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Solution

The fourth proportional to 817.75, 1,128.43 and 463.67 is: 639.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.75 : 1,128.43 = 463.67 : x
  2. Step 2: Convert to fraction form
    817.75/1,128.43 = 463.67/x
  3. Step 3: Cross multiply
    817.75x = 1,128.43 × 463.67
  4. Step 4: Simplify right side
    817.75x = 523,220.80
  5. Step 5: Solve for x
    x = 523,220.80/817.75
  6. Step 6: Final answer
    x = 639.83

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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.