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Finding the Fourth Proportional to 819.90, 1,230.03 and 473.40

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Solution

The fourth proportional to 819.90, 1,230.03 and 473.40 is: 710.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.90 : 1,230.03 = 473.40 : x
  2. Step 2: Convert to fraction form
    819.90/1,230.03 = 473.40/x
  3. Step 3: Cross multiply
    819.90x = 1,230.03 × 473.40
  4. Step 4: Simplify right side
    819.90x = 582,296.20
  5. Step 5: Solve for x
    x = 582,296.20/819.90
  6. Step 6: Final answer
    x = 710.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.