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Finding the Fourth Proportional to 906.88, 1,353.46 and 819.40

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Solution

The fourth proportional to 906.88, 1,353.46 and 819.40 is: 1,222.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.88 : 1,353.46 = 819.40 : x
  2. Step 2: Convert to fraction form
    906.88/1,353.46 = 819.40/x
  3. Step 3: Cross multiply
    906.88x = 1,353.46 × 819.40
  4. Step 4: Simplify right side
    906.88x = 1,109,025.12
  5. Step 5: Solve for x
    x = 1,109,025.12/906.88
  6. Step 6: Final answer
    x = 1,222.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.