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Finding the Fourth Proportional to 571.88, 789.18 and 309.90

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Solution

The fourth proportional to 571.88, 789.18 and 309.90 is: 427.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.88 : 789.18 = 309.90 : x
  2. Step 2: Convert to fraction form
    571.88/789.18 = 309.90/x
  3. Step 3: Cross multiply
    571.88x = 789.18 × 309.90
  4. Step 4: Simplify right side
    571.88x = 244,566.88
  5. Step 5: Solve for x
    x = 244,566.88/571.88
  6. Step 6: Final answer
    x = 427.66

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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.