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Finding the Fourth Proportional to 862.19, 1,189.82 and 469.21

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Solution

The fourth proportional to 862.19, 1,189.82 and 469.21 is: 647.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.19 : 1,189.82 = 469.21 : x
  2. Step 2: Convert to fraction form
    862.19/1,189.82 = 469.21/x
  3. Step 3: Cross multiply
    862.19x = 1,189.82 × 469.21
  4. Step 4: Simplify right side
    862.19x = 558,275.44
  5. Step 5: Solve for x
    x = 558,275.44/862.19
  6. Step 6: Final answer
    x = 647.51

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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.