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Finding the Fourth Proportional to 817.65, 1,128.33 and 522.99

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Solution

The fourth proportional to 817.65, 1,128.33 and 522.99 is: 721.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.65 : 1,128.33 = 522.99 : x
  2. Step 2: Convert to fraction form
    817.65/1,128.33 = 522.99/x
  3. Step 3: Cross multiply
    817.65x = 1,128.33 × 522.99
  4. Step 4: Simplify right side
    817.65x = 590,105.31
  5. Step 5: Solve for x
    x = 590,105.31/817.65
  6. Step 6: Final answer
    x = 721.71

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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.