Home / 2,371.20-3,556.80-639.78

Finding the Fourth Proportional to 2,371.20, 3,556.80 and 639.78

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Solution

The fourth proportional to 2,371.20, 3,556.80 and 639.78 is: 959.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,371.20 : 3,556.80 = 639.78 : x
  2. Step 2: Convert to fraction form
    2,371.20/3,556.80 = 639.78/x
  3. Step 3: Cross multiply
    2,371.20x = 3,556.80 × 639.78
  4. Step 4: Simplify right side
    2,371.20x = 2,275,569.50
  5. Step 5: Solve for x
    x = 2,275,569.50/2,371.20
  6. Step 6: Final answer
    x = 959.67

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1.5x scale

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.