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Finding the Fourth Proportional to 803.99, 1,205.28 and 474.57

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Solution

The fourth proportional to 803.99, 1,205.28 and 474.57 is: 711.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.99 : 1,205.28 = 474.57 : x
  2. Step 2: Convert to fraction form
    803.99/1,205.28 = 474.57/x
  3. Step 3: Cross multiply
    803.99x = 1,205.28 × 474.57
  4. Step 4: Simplify right side
    803.99x = 571,989.73
  5. Step 5: Solve for x
    x = 571,989.73/803.99
  6. Step 6: Final answer
    x = 711.44

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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.