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Finding the Fourth Proportional to 733.50, 1,012.20 and 438.78

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Solution

The fourth proportional to 733.50, 1,012.20 and 438.78 is: 605.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    733.50 : 1,012.20 = 438.78 : x
  2. Step 2: Convert to fraction form
    733.50/1,012.20 = 438.78/x
  3. Step 3: Cross multiply
    733.50x = 1,012.20 × 438.78
  4. Step 4: Simplify right side
    733.50x = 444,133.12
  5. Step 5: Solve for x
    x = 444,133.12/733.50
  6. Step 6: Final answer
    x = 605.50

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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.