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Finding the Fourth Proportional to 803.47, 1,108.81 and 449.38

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Solution

The fourth proportional to 803.47, 1,108.81 and 449.38 is: 620.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.47 : 1,108.81 = 449.38 : x
  2. Step 2: Convert to fraction form
    803.47/1,108.81 = 449.38/x
  3. Step 3: Cross multiply
    803.47x = 1,108.81 × 449.38
  4. Step 4: Simplify right side
    803.47x = 498,278.99
  5. Step 5: Solve for x
    x = 498,278.99/803.47
  6. Step 6: Final answer
    x = 620.16

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1.5x scale

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.