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Finding the Fourth Proportional to 404.70, 558.54 and 393.72

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Solution

The fourth proportional to 404.70, 558.54 and 393.72 is: 543.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.70 : 558.54 = 393.72 : x
  2. Step 2: Convert to fraction form
    404.70/558.54 = 393.72/x
  3. Step 3: Cross multiply
    404.70x = 558.54 × 393.72
  4. Step 4: Simplify right side
    404.70x = 219,908.37
  5. Step 5: Solve for x
    x = 219,908.37/404.70
  6. Step 6: Final answer
    x = 543.39

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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.