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Finding the Fourth Proportional to 2,371.31, 3,556.49 and 639.53

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Solution

The fourth proportional to 2,371.31, 3,556.49 and 639.53 is: 959.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,371.31 : 3,556.49 = 639.53 : x
  2. Step 2: Convert to fraction form
    2,371.31/3,556.49 = 639.53/x
  3. Step 3: Cross multiply
    2,371.31x = 3,556.49 × 639.53
  4. Step 4: Simplify right side
    2,371.31x = 2,274,478.85
  5. Step 5: Solve for x
    x = 2,274,478.85/2,371.31
  6. Step 6: Final answer
    x = 959.17

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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.