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Finding the Fourth Proportional to 803.45, 1,108.10 and 784.43

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Solution

The fourth proportional to 803.45, 1,108.10 and 784.43 is: 1,081.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.45 : 1,108.10 = 784.43 : x
  2. Step 2: Convert to fraction form
    803.45/1,108.10 = 784.43/x
  3. Step 3: Cross multiply
    803.45x = 1,108.10 × 784.43
  4. Step 4: Simplify right side
    803.45x = 869,229.28
  5. Step 5: Solve for x
    x = 869,229.28/803.45
  6. Step 6: Final answer
    x = 1,081.87

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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.