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Finding the Fourth Proportional to 571.60, 857.39 and 138.76

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Solution

The fourth proportional to 571.60, 857.39 and 138.76 is: 208.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.60 : 857.39 = 138.76 : x
  2. Step 2: Convert to fraction form
    571.60/857.39 = 138.76/x
  3. Step 3: Cross multiply
    571.60x = 857.39 × 138.76
  4. Step 4: Simplify right side
    571.60x = 118,971.44
  5. Step 5: Solve for x
    x = 118,971.44/571.60
  6. Step 6: Final answer
    x = 208.14

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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.