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Finding the Fourth Proportional to 818.85, 1,129.68 and 520.08

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Solution

The fourth proportional to 818.85, 1,129.68 and 520.08 is: 717.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.85 : 1,129.68 = 520.08 : x
  2. Step 2: Convert to fraction form
    818.85/1,129.68 = 520.08/x
  3. Step 3: Cross multiply
    818.85x = 1,129.68 × 520.08
  4. Step 4: Simplify right side
    818.85x = 587,523.97
  5. Step 5: Solve for x
    x = 587,523.97/818.85
  6. Step 6: Final answer
    x = 717.50

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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.