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Finding the Fourth Proportional to 862.86, 1,294.49 and 315.05

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Solution

The fourth proportional to 862.86, 1,294.49 and 315.05 is: 472.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.86 : 1,294.49 = 315.05 : x
  2. Step 2: Convert to fraction form
    862.86/1,294.49 = 315.05/x
  3. Step 3: Cross multiply
    862.86x = 1,294.49 × 315.05
  4. Step 4: Simplify right side
    862.86x = 407,821.62
  5. Step 5: Solve for x
    x = 407,821.62/862.86
  6. Step 6: Final answer
    x = 472.64

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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.