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Finding the Fourth Proportional to 803.05, 1,111.13 and 699.79

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Solution

The fourth proportional to 803.05, 1,111.13 and 699.79 is: 968.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.05 : 1,111.13 = 699.79 : x
  2. Step 2: Convert to fraction form
    803.05/1,111.13 = 699.79/x
  3. Step 3: Cross multiply
    803.05x = 1,111.13 × 699.79
  4. Step 4: Simplify right side
    803.05x = 777,557.66
  5. Step 5: Solve for x
    x = 777,557.66/803.05
  6. Step 6: Final answer
    x = 968.26

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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.