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Finding the Fourth Proportional to 571.41, 857.11 and 138.57

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Solution

The fourth proportional to 571.41, 857.11 and 138.57 is: 207.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.41 : 857.11 = 138.57 : x
  2. Step 2: Convert to fraction form
    571.41/857.11 = 138.57/x
  3. Step 3: Cross multiply
    571.41x = 857.11 × 138.57
  4. Step 4: Simplify right side
    571.41x = 118,769.39
  5. Step 5: Solve for x
    x = 118,769.39/571.41
  6. Step 6: Final answer
    x = 207.85

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Double scale
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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.