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Finding the Fourth Proportional to 1,792.31, 2,688.39 and 818.40

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Solution

The fourth proportional to 1,792.31, 2,688.39 and 818.40 is: 1,227.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,792.31 : 2,688.39 = 818.40 : x
  2. Step 2: Convert to fraction form
    1,792.31/2,688.39 = 818.40/x
  3. Step 3: Cross multiply
    1,792.31x = 2,688.39 × 818.40
  4. Step 4: Simplify right side
    1,792.31x = 2,200,178.38
  5. Step 5: Solve for x
    x = 2,200,178.38/1,792.31
  6. Step 6: Final answer
    x = 1,227.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.