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Finding the Fourth Proportional to 803.39, 1,205.06 and 340.87

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Solution

The fourth proportional to 803.39, 1,205.06 and 340.87 is: 511.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.39 : 1,205.06 = 340.87 : x
  2. Step 2: Convert to fraction form
    803.39/1,205.06 = 340.87/x
  3. Step 3: Cross multiply
    803.39x = 1,205.06 × 340.87
  4. Step 4: Simplify right side
    803.39x = 410,768.80
  5. Step 5: Solve for x
    x = 410,768.80/803.39
  6. Step 6: Final answer
    x = 511.29

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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.