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Finding the Fourth Proportional to 828, 1,142.64 and 478.71

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Solution

The fourth proportional to 828, 1,142.64 and 478.71 is: 660.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    828 : 1,142.64 = 478.71 : x
  2. Step 2: Convert to fraction form
    828/1,142.64 = 478.71/x
  3. Step 3: Cross multiply
    828x = 1,142.64 × 478.71
  4. Step 4: Simplify right side
    828x = 546,993.19
  5. Step 5: Solve for x
    x = 546,993.19/828
  6. Step 6: Final answer
    x = 660.62

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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.