Home / 2,140.52-3,208.60-840.20

Finding the Fourth Proportional to 2,140.52, 3,208.60 and 840.20

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Solution

The fourth proportional to 2,140.52, 3,208.60 and 840.20 is: 1,259.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.52 : 3,208.60 = 840.20 : x
  2. Step 2: Convert to fraction form
    2,140.52/3,208.60 = 840.20/x
  3. Step 3: Cross multiply
    2,140.52x = 3,208.60 × 840.20
  4. Step 4: Simplify right side
    2,140.52x = 2,695,865.72
  5. Step 5: Solve for x
    x = 2,695,865.72/2,140.52
  6. Step 6: Final answer
    x = 1,259.44

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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.