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Finding the Fourth Proportional to 819.36, 1,225.95 and 489.08

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Solution

The fourth proportional to 819.36, 1,225.95 and 489.08 is: 731.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.36 : 1,225.95 = 489.08 : x
  2. Step 2: Convert to fraction form
    819.36/1,225.95 = 489.08/x
  3. Step 3: Cross multiply
    819.36x = 1,225.95 × 489.08
  4. Step 4: Simplify right side
    819.36x = 599,581.50
  5. Step 5: Solve for x
    x = 599,581.50/819.36
  6. Step 6: Final answer
    x = 731.77

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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.