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Finding the Fourth Proportional to 803.55, 1,205.38 and 341.28

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Solution

The fourth proportional to 803.55, 1,205.38 and 341.28 is: 511.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.55 : 1,205.38 = 341.28 : x
  2. Step 2: Convert to fraction form
    803.55/1,205.38 = 341.28/x
  3. Step 3: Cross multiply
    803.55x = 1,205.38 × 341.28
  4. Step 4: Simplify right side
    803.55x = 411,367.99
  5. Step 5: Solve for x
    x = 411,367.99/803.55
  6. Step 6: Final answer
    x = 511.94

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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.