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Finding the Fourth Proportional to 571.69, 857.54 and 138.85

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Solution

The fourth proportional to 571.69, 857.54 and 138.85 is: 208.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.69 : 857.54 = 138.85 : x
  2. Step 2: Convert to fraction form
    571.69/857.54 = 138.85/x
  3. Step 3: Cross multiply
    571.69x = 857.54 × 138.85
  4. Step 4: Simplify right side
    571.69x = 119,069.43
  5. Step 5: Solve for x
    x = 119,069.43/571.69
  6. Step 6: Final answer
    x = 208.28

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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.