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Finding the Fourth Proportional to 553.93, 831.41 and 280.21

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Solution

The fourth proportional to 553.93, 831.41 and 280.21 is: 420.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.93 : 831.41 = 280.21 : x
  2. Step 2: Convert to fraction form
    553.93/831.41 = 280.21/x
  3. Step 3: Cross multiply
    553.93x = 831.41 × 280.21
  4. Step 4: Simplify right side
    553.93x = 232,972.43
  5. Step 5: Solve for x
    x = 232,972.43/553.93
  6. Step 6: Final answer
    x = 420.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.