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Finding the Fourth Proportional to 572.07, 789.20 and 439.05

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Solution

The fourth proportional to 572.07, 789.20 and 439.05 is: 605.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.07 : 789.20 = 439.05 : x
  2. Step 2: Convert to fraction form
    572.07/789.20 = 439.05/x
  3. Step 3: Cross multiply
    572.07x = 789.20 × 439.05
  4. Step 4: Simplify right side
    572.07x = 346,499.31
  5. Step 5: Solve for x
    x = 346,499.31/572.07
  6. Step 6: Final answer
    x = 605.70

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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.