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Finding the Fourth Proportional to 907.35, 1,243.42 and 819.87

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Solution

The fourth proportional to 907.35, 1,243.42 and 819.87 is: 1,123.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.35 : 1,243.42 = 819.87 : x
  2. Step 2: Convert to fraction form
    907.35/1,243.42 = 819.87/x
  3. Step 3: Cross multiply
    907.35x = 1,243.42 × 819.87
  4. Step 4: Simplify right side
    907.35x = 1,019,432.44
  5. Step 5: Solve for x
    x = 1,019,432.44/907.35
  6. Step 6: Final answer
    x = 1,123.53

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.