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Finding the Fourth Proportional to 817.79, 1,128.62 and 523.31

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Solution

The fourth proportional to 817.79, 1,128.62 and 523.31 is: 722.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.79 : 1,128.62 = 523.31 : x
  2. Step 2: Convert to fraction form
    817.79/1,128.62 = 523.31/x
  3. Step 3: Cross multiply
    817.79x = 1,128.62 × 523.31
  4. Step 4: Simplify right side
    817.79x = 590,618.13
  5. Step 5: Solve for x
    x = 590,618.13/817.79
  6. Step 6: Final answer
    x = 722.21

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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.