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Finding the Fourth Proportional to 1,204.78, 1,807.20 and 339.04

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Solution

The fourth proportional to 1,204.78, 1,807.20 and 339.04 is: 508.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,204.78 : 1,807.20 = 339.04 : x
  2. Step 2: Convert to fraction form
    1,204.78/1,807.20 = 339.04/x
  3. Step 3: Cross multiply
    1,204.78x = 1,807.20 × 339.04
  4. Step 4: Simplify right side
    1,204.78x = 612,713.09
  5. Step 5: Solve for x
    x = 612,713.09/1,204.78
  6. Step 6: Final answer
    x = 508.57

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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.