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Finding the Fourth Proportional to 523.57, 785.28 and 138.82

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Solution

The fourth proportional to 523.57, 785.28 and 138.82 is: 208.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.57 : 785.28 = 138.82 : x
  2. Step 2: Convert to fraction form
    523.57/785.28 = 138.82/x
  3. Step 3: Cross multiply
    523.57x = 785.28 × 138.82
  4. Step 4: Simplify right side
    523.57x = 109,012.57
  5. Step 5: Solve for x
    x = 109,012.57/523.57
  6. Step 6: Final answer
    x = 208.21

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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.