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Finding the Fourth Proportional to 803.89, 1,208 and 613.81

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Solution

The fourth proportional to 803.89, 1,208 and 613.81 is: 922.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.89 : 1,208 = 613.81 : x
  2. Step 2: Convert to fraction form
    803.89/1,208 = 613.81/x
  3. Step 3: Cross multiply
    803.89x = 1,208 × 613.81
  4. Step 4: Simplify right side
    803.89x = 741,482.48
  5. Step 5: Solve for x
    x = 741,482.48/803.89
  6. Step 6: Final answer
    x = 922.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.