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Finding the Fourth Proportional to 818.25, 1,128.82 and 545.46

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Solution

The fourth proportional to 818.25, 1,128.82 and 545.46 is: 752.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.25 : 1,128.82 = 545.46 : x
  2. Step 2: Convert to fraction form
    818.25/1,128.82 = 545.46/x
  3. Step 3: Cross multiply
    818.25x = 1,128.82 × 545.46
  4. Step 4: Simplify right side
    818.25x = 615,717.79
  5. Step 5: Solve for x
    x = 615,717.79/818.25
  6. Step 6: Final answer
    x = 752.49

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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.