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Finding the Fourth Proportional to 571.64, 857.46 and 138.80

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Solution

The fourth proportional to 571.64, 857.46 and 138.80 is: 208.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.64 : 857.46 = 138.80 : x
  2. Step 2: Convert to fraction form
    571.64/857.46 = 138.80/x
  3. Step 3: Cross multiply
    571.64x = 857.46 × 138.80
  4. Step 4: Simplify right side
    571.64x = 119,012.90
  5. Step 5: Solve for x
    x = 119,012.90/571.64
  6. Step 6: Final answer
    x = 208.20

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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.