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Finding the Fourth Proportional to 820.02, 1,131.62 and 447.00

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Solution

The fourth proportional to 820.02, 1,131.62 and 447.00 is: 616.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.02 : 1,131.62 = 447.00 : x
  2. Step 2: Convert to fraction form
    820.02/1,131.62 = 447.00/x
  3. Step 3: Cross multiply
    820.02x = 1,131.62 × 447.00
  4. Step 4: Simplify right side
    820.02x = 505,830.19
  5. Step 5: Solve for x
    x = 505,830.19/820.02
  6. Step 6: Final answer
    x = 616.85

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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.