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Finding the Fourth Proportional to 404.78, 558.60 and 247.39

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Solution

The fourth proportional to 404.78, 558.60 and 247.39 is: 341.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.78 : 558.60 = 247.39 : x
  2. Step 2: Convert to fraction form
    404.78/558.60 = 247.39/x
  3. Step 3: Cross multiply
    404.78x = 558.60 × 247.39
  4. Step 4: Simplify right side
    404.78x = 138,192.05
  5. Step 5: Solve for x
    x = 138,192.05/404.78
  6. Step 6: Final answer
    x = 341.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.