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Finding the Fourth Proportional to 818.35, 1,128.57 and 609.05

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Solution

The fourth proportional to 818.35, 1,128.57 and 609.05 is: 839.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.35 : 1,128.57 = 609.05 : x
  2. Step 2: Convert to fraction form
    818.35/1,128.57 = 609.05/x
  3. Step 3: Cross multiply
    818.35x = 1,128.57 × 609.05
  4. Step 4: Simplify right side
    818.35x = 687,349.92
  5. Step 5: Solve for x
    x = 687,349.92/818.35
  6. Step 6: Final answer
    x = 839.92

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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.