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Finding the Fourth Proportional to 818.36, 1,227.33 and 688.45

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Solution

The fourth proportional to 818.36, 1,227.33 and 688.45 is: 1,032.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.36 : 1,227.33 = 688.45 : x
  2. Step 2: Convert to fraction form
    818.36/1,227.33 = 688.45/x
  3. Step 3: Cross multiply
    818.36x = 1,227.33 × 688.45
  4. Step 4: Simplify right side
    818.36x = 844,955.34
  5. Step 5: Solve for x
    x = 844,955.34/818.36
  6. Step 6: Final answer
    x = 1,032.50

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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.