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Finding the Fourth Proportional to 820.96, 1,132.80 and 471.64

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Solution

The fourth proportional to 820.96, 1,132.80 and 471.64 is: 650.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.96 : 1,132.80 = 471.64 : x
  2. Step 2: Convert to fraction form
    820.96/1,132.80 = 471.64/x
  3. Step 3: Cross multiply
    820.96x = 1,132.80 × 471.64
  4. Step 4: Simplify right side
    820.96x = 534,273.79
  5. Step 5: Solve for x
    x = 534,273.79/820.96
  6. Step 6: Final answer
    x = 650.79

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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.