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Finding the Fourth Proportional to 812.64, 1,219.96 and 553.76

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Solution

The fourth proportional to 812.64, 1,219.96 and 553.76 is: 831.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.64 : 1,219.96 = 553.76 : x
  2. Step 2: Convert to fraction form
    812.64/1,219.96 = 553.76/x
  3. Step 3: Cross multiply
    812.64x = 1,219.96 × 553.76
  4. Step 4: Simplify right side
    812.64x = 675,565.05
  5. Step 5: Solve for x
    x = 675,565.05/812.64
  6. Step 6: Final answer
    x = 831.32

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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.