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Finding the Fourth Proportional to 553.90, 831.71 and 477.72

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Solution

The fourth proportional to 553.90, 831.71 and 477.72 is: 717.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.90 : 831.71 = 477.72 : x
  2. Step 2: Convert to fraction form
    553.90/831.71 = 477.72/x
  3. Step 3: Cross multiply
    553.90x = 831.71 × 477.72
  4. Step 4: Simplify right side
    553.90x = 397,324.50
  5. Step 5: Solve for x
    x = 397,324.50/553.90
  6. Step 6: Final answer
    x = 717.32

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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.