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Finding the Fourth Proportional to 821.92, 1,134.24 and 472.64

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Solution

The fourth proportional to 821.92, 1,134.24 and 472.64 is: 652.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.92 : 1,134.24 = 472.64 : x
  2. Step 2: Convert to fraction form
    821.92/1,134.24 = 472.64/x
  3. Step 3: Cross multiply
    821.92x = 1,134.24 × 472.64
  4. Step 4: Simplify right side
    821.92x = 536,087.19
  5. Step 5: Solve for x
    x = 536,087.19/821.92
  6. Step 6: Final answer
    x = 652.24

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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.