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Finding the Fourth Proportional to 789.05, 1,088.97 and 439.74

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Solution

The fourth proportional to 789.05, 1,088.97 and 439.74 is: 606.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.05 : 1,088.97 = 439.74 : x
  2. Step 2: Convert to fraction form
    789.05/1,088.97 = 439.74/x
  3. Step 3: Cross multiply
    789.05x = 1,088.97 × 439.74
  4. Step 4: Simplify right side
    789.05x = 478,862.02
  5. Step 5: Solve for x
    x = 478,862.02/789.05
  6. Step 6: Final answer
    x = 606.88

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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.