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Finding the Fourth Proportional to 885.57, 1,329.01 and 330.78

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Solution

The fourth proportional to 885.57, 1,329.01 and 330.78 is: 496.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.57 : 1,329.01 = 330.78 : x
  2. Step 2: Convert to fraction form
    885.57/1,329.01 = 330.78/x
  3. Step 3: Cross multiply
    885.57x = 1,329.01 × 330.78
  4. Step 4: Simplify right side
    885.57x = 439,614.08
  5. Step 5: Solve for x
    x = 439,614.08/885.57
  6. Step 6: Final answer
    x = 496.42

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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.