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Finding the Fourth Proportional to 571.66, 857.49 and 138.81

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Solution

The fourth proportional to 571.66, 857.49 and 138.81 is: 208.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.66 : 857.49 = 138.81 : x
  2. Step 2: Convert to fraction form
    571.66/857.49 = 138.81/x
  3. Step 3: Cross multiply
    571.66x = 857.49 × 138.81
  4. Step 4: Simplify right side
    571.66x = 119,028.19
  5. Step 5: Solve for x
    x = 119,028.19/571.66
  6. Step 6: Final answer
    x = 208.22

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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.