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Finding the Fourth Proportional to 820.11, 1,229.26 and 657.45

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Solution

The fourth proportional to 820.11, 1,229.26 and 657.45 is: 985.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.11 : 1,229.26 = 657.45 : x
  2. Step 2: Convert to fraction form
    820.11/1,229.26 = 657.45/x
  3. Step 3: Cross multiply
    820.11x = 1,229.26 × 657.45
  4. Step 4: Simplify right side
    820.11x = 808,176.99
  5. Step 5: Solve for x
    x = 808,176.99/820.11
  6. Step 6: Final answer
    x = 985.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.