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Finding the Fourth Proportional to 603.21, 831.78 and 381.90

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Solution

The fourth proportional to 603.21, 831.78 and 381.90 is: 526.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.21 : 831.78 = 381.90 : x
  2. Step 2: Convert to fraction form
    603.21/831.78 = 381.90/x
  3. Step 3: Cross multiply
    603.21x = 831.78 × 381.90
  4. Step 4: Simplify right side
    603.21x = 317,656.78
  5. Step 5: Solve for x
    x = 317,656.78/603.21
  6. Step 6: Final answer
    x = 526.61

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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.