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Finding the Fourth Proportional to 819.60, 1,131.08 and 470.32

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Solution

The fourth proportional to 819.60, 1,131.08 and 470.32 is: 649.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.60 : 1,131.08 = 470.32 : x
  2. Step 2: Convert to fraction form
    819.60/1,131.08 = 470.32/x
  3. Step 3: Cross multiply
    819.60x = 1,131.08 × 470.32
  4. Step 4: Simplify right side
    819.60x = 531,969.55
  5. Step 5: Solve for x
    x = 531,969.55/819.60
  6. Step 6: Final answer
    x = 649.06

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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.