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Finding the Fourth Proportional to 807.73, 1,115.43 and 777.64

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Solution

The fourth proportional to 807.73, 1,115.43 and 777.64 is: 1,073.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.73 : 1,115.43 = 777.64 : x
  2. Step 2: Convert to fraction form
    807.73/1,115.43 = 777.64/x
  3. Step 3: Cross multiply
    807.73x = 1,115.43 × 777.64
  4. Step 4: Simplify right side
    807.73x = 867,402.99
  5. Step 5: Solve for x
    x = 867,402.99/807.73
  6. Step 6: Final answer
    x = 1,073.88

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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.