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Finding the Fourth Proportional to 818.59, 1,128.09 and 523.35

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Solution

The fourth proportional to 818.59, 1,128.09 and 523.35 is: 721.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.59 : 1,128.09 = 523.35 : x
  2. Step 2: Convert to fraction form
    818.59/1,128.09 = 523.35/x
  3. Step 3: Cross multiply
    818.59x = 1,128.09 × 523.35
  4. Step 4: Simplify right side
    818.59x = 590,385.90
  5. Step 5: Solve for x
    x = 590,385.90/818.59
  6. Step 6: Final answer
    x = 721.22

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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.