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Finding the Fourth Proportional to 404.78, 558.15 and 342.86

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Solution

The fourth proportional to 404.78, 558.15 and 342.86 is: 472.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.78 : 558.15 = 342.86 : x
  2. Step 2: Convert to fraction form
    404.78/558.15 = 342.86/x
  3. Step 3: Cross multiply
    404.78x = 558.15 × 342.86
  4. Step 4: Simplify right side
    404.78x = 191,367.31
  5. Step 5: Solve for x
    x = 191,367.31/404.78
  6. Step 6: Final answer
    x = 472.77

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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.