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Finding the Fourth Proportional to 803.70, 1,205.85 and 317.09

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Solution

The fourth proportional to 803.70, 1,205.85 and 317.09 is: 475.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.70 : 1,205.85 = 317.09 : x
  2. Step 2: Convert to fraction form
    803.70/1,205.85 = 317.09/x
  3. Step 3: Cross multiply
    803.70x = 1,205.85 × 317.09
  4. Step 4: Simplify right side
    803.70x = 382,362.98
  5. Step 5: Solve for x
    x = 382,362.98/803.70
  6. Step 6: Final answer
    x = 475.75

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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.