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Finding the Fourth Proportional to 2,371.47, 3,556.80 and 639.69

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Solution

The fourth proportional to 2,371.47, 3,556.80 and 639.69 is: 959.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,371.47 : 3,556.80 = 639.69 : x
  2. Step 2: Convert to fraction form
    2,371.47/3,556.80 = 639.69/x
  3. Step 3: Cross multiply
    2,371.47x = 3,556.80 × 639.69
  4. Step 4: Simplify right side
    2,371.47x = 2,275,246.19
  5. Step 5: Solve for x
    x = 2,275,246.19/2,371.47
  6. Step 6: Final answer
    x = 959.42

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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.