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Finding the Fourth Proportional to 819.18, 1,129.95 and 487.37

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Solution

The fourth proportional to 819.18, 1,129.95 and 487.37 is: 672.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.18 : 1,129.95 = 487.37 : x
  2. Step 2: Convert to fraction form
    819.18/1,129.95 = 487.37/x
  3. Step 3: Cross multiply
    819.18x = 1,129.95 × 487.37
  4. Step 4: Simplify right side
    819.18x = 550,698.08
  5. Step 5: Solve for x
    x = 550,698.08/819.18
  6. Step 6: Final answer
    x = 672.26

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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.