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Finding the Fourth Proportional to 803.22, 1,205.28 and 316.61

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Solution

The fourth proportional to 803.22, 1,205.28 and 316.61 is: 475.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.22 : 1,205.28 = 316.61 : x
  2. Step 2: Convert to fraction form
    803.22/1,205.28 = 316.61/x
  3. Step 3: Cross multiply
    803.22x = 1,205.28 × 316.61
  4. Step 4: Simplify right side
    803.22x = 381,602.19
  5. Step 5: Solve for x
    x = 381,602.19/803.22
  6. Step 6: Final answer
    x = 475.09

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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.