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Finding the Fourth Proportional to 821.12, 1,133.08 and 467.05

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Solution

The fourth proportional to 821.12, 1,133.08 and 467.05 is: 644.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.12 : 1,133.08 = 467.05 : x
  2. Step 2: Convert to fraction form
    821.12/1,133.08 = 467.05/x
  3. Step 3: Cross multiply
    821.12x = 1,133.08 × 467.05
  4. Step 4: Simplify right side
    821.12x = 529,205.01
  5. Step 5: Solve for x
    x = 529,205.01/821.12
  6. Step 6: Final answer
    x = 644.49

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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.