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Finding the Fourth Proportional to 862.38, 1,190.09 and 469.40

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Solution

The fourth proportional to 862.38, 1,190.09 and 469.40 is: 647.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.38 : 1,190.09 = 469.40 : x
  2. Step 2: Convert to fraction form
    862.38/1,190.09 = 469.40/x
  3. Step 3: Cross multiply
    862.38x = 1,190.09 × 469.40
  4. Step 4: Simplify right side
    862.38x = 558,630.05
  5. Step 5: Solve for x
    x = 558,630.05/862.38
  6. Step 6: Final answer
    x = 647.78

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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.