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Finding the Fourth Proportional to 819.11, 1,130.38 and 469.79

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Solution

The fourth proportional to 819.11, 1,130.38 and 469.79 is: 648.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.11 : 1,130.38 = 469.79 : x
  2. Step 2: Convert to fraction form
    819.11/1,130.38 = 469.79/x
  3. Step 3: Cross multiply
    819.11x = 1,130.38 × 469.79
  4. Step 4: Simplify right side
    819.11x = 531,041.22
  5. Step 5: Solve for x
    x = 531,041.22/819.11
  6. Step 6: Final answer
    x = 648.31

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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.