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Finding the Fourth Proportional to 885.91, 1,329.47 and 308.78

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Solution

The fourth proportional to 885.91, 1,329.47 and 308.78 is: 463.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.91 : 1,329.47 = 308.78 : x
  2. Step 2: Convert to fraction form
    885.91/1,329.47 = 308.78/x
  3. Step 3: Cross multiply
    885.91x = 1,329.47 × 308.78
  4. Step 4: Simplify right side
    885.91x = 410,513.75
  5. Step 5: Solve for x
    x = 410,513.75/885.91
  6. Step 6: Final answer
    x = 463.38

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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.