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Finding the Fourth Proportional to 821.32, 1,133.90 and 631.92

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Solution

The fourth proportional to 821.32, 1,133.90 and 631.92 is: 872.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.32 : 1,133.90 = 631.92 : x
  2. Step 2: Convert to fraction form
    821.32/1,133.90 = 631.92/x
  3. Step 3: Cross multiply
    821.32x = 1,133.90 × 631.92
  4. Step 4: Simplify right side
    821.32x = 716,534.09
  5. Step 5: Solve for x
    x = 716,534.09/821.32
  6. Step 6: Final answer
    x = 872.42

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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.