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Finding the Fourth Proportional to 1,478.46, 2,217.78 and 553.99

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Solution

The fourth proportional to 1,478.46, 2,217.78 and 553.99 is: 831.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.46 : 2,217.78 = 553.99 : x
  2. Step 2: Convert to fraction form
    1,478.46/2,217.78 = 553.99/x
  3. Step 3: Cross multiply
    1,478.46x = 2,217.78 × 553.99
  4. Step 4: Simplify right side
    1,478.46x = 1,228,627.94
  5. Step 5: Solve for x
    x = 1,228,627.94/1,478.46
  6. Step 6: Final answer
    x = 831.02

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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.