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Finding the Fourth Proportional to 803.36, 1,205.68 and 316.36

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Solution

The fourth proportional to 803.36, 1,205.68 and 316.36 is: 474.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.36 : 1,205.68 = 316.36 : x
  2. Step 2: Convert to fraction form
    803.36/1,205.68 = 316.36/x
  3. Step 3: Cross multiply
    803.36x = 1,205.68 × 316.36
  4. Step 4: Simplify right side
    803.36x = 381,428.92
  5. Step 5: Solve for x
    x = 381,428.92/803.36
  6. Step 6: Final answer
    x = 474.79

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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.