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Finding the Fourth Proportional to 404.74, 603.81 and 393.58

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Solution

The fourth proportional to 404.74, 603.81 and 393.58 is: 587.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.74 : 603.81 = 393.58 : x
  2. Step 2: Convert to fraction form
    404.74/603.81 = 393.58/x
  3. Step 3: Cross multiply
    404.74x = 603.81 × 393.58
  4. Step 4: Simplify right side
    404.74x = 237,647.54
  5. Step 5: Solve for x
    x = 237,647.54/404.74
  6. Step 6: Final answer
    x = 587.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.