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Finding the Fourth Proportional to 571.50, 789.06 and 438.48

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Solution

The fourth proportional to 571.50, 789.06 and 438.48 is: 605.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.50 : 789.06 = 438.48 : x
  2. Step 2: Convert to fraction form
    571.50/789.06 = 438.48/x
  3. Step 3: Cross multiply
    571.50x = 789.06 × 438.48
  4. Step 4: Simplify right side
    571.50x = 345,987.03
  5. Step 5: Solve for x
    x = 345,987.03/571.50
  6. Step 6: Final answer
    x = 605.40

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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.