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Finding the Fourth Proportional to 803.49, 1,205.42 and 316.55

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Solution

The fourth proportional to 803.49, 1,205.42 and 316.55 is: 474.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.49 : 1,205.42 = 316.55 : x
  2. Step 2: Convert to fraction form
    803.49/1,205.42 = 316.55/x
  3. Step 3: Cross multiply
    803.49x = 1,205.42 × 316.55
  4. Step 4: Simplify right side
    803.49x = 381,568.09
  5. Step 5: Solve for x
    x = 381,568.09/803.49
  6. Step 6: Final answer
    x = 474.89

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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.