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Finding the Fourth Proportional to 803.86, 1,205.07 and 290.74

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Solution

The fourth proportional to 803.86, 1,205.07 and 290.74 is: 435.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.86 : 1,205.07 = 290.74 : x
  2. Step 2: Convert to fraction form
    803.86/1,205.07 = 290.74/x
  3. Step 3: Cross multiply
    803.86x = 1,205.07 × 290.74
  4. Step 4: Simplify right side
    803.86x = 350,362.05
  5. Step 5: Solve for x
    x = 350,362.05/803.86
  6. Step 6: Final answer
    x = 435.85

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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.