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Finding the Fourth Proportional to 803.04, 1,107.42 and 685.08

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Solution

The fourth proportional to 803.04, 1,107.42 and 685.08 is: 944.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.04 : 1,107.42 = 685.08 : x
  2. Step 2: Convert to fraction form
    803.04/1,107.42 = 685.08/x
  3. Step 3: Cross multiply
    803.04x = 1,107.42 × 685.08
  4. Step 4: Simplify right side
    803.04x = 758,671.29
  5. Step 5: Solve for x
    x = 758,671.29/803.04
  6. Step 6: Final answer
    x = 944.75

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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.