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Finding the Fourth Proportional to 403.72, 604.62 and 339.40

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Solution

The fourth proportional to 403.72, 604.62 and 339.40 is: 508.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.72 : 604.62 = 339.40 : x
  2. Step 2: Convert to fraction form
    403.72/604.62 = 339.40/x
  3. Step 3: Cross multiply
    403.72x = 604.62 × 339.40
  4. Step 4: Simplify right side
    403.72x = 205,208.03
  5. Step 5: Solve for x
    x = 205,208.03/403.72
  6. Step 6: Final answer
    x = 508.29

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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.