Home / 2,159.20-3,239.60-861.60

Finding the Fourth Proportional to 2,159.20, 3,239.60 and 861.60

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Solution

The fourth proportional to 2,159.20, 3,239.60 and 861.60 is: 1,292.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.20 : 3,239.60 = 861.60 : x
  2. Step 2: Convert to fraction form
    2,159.20/3,239.60 = 861.60/x
  3. Step 3: Cross multiply
    2,159.20x = 3,239.60 × 861.60
  4. Step 4: Simplify right side
    2,159.20x = 2,791,239.36
  5. Step 5: Solve for x
    x = 2,791,239.36/2,159.20
  6. Step 6: Final answer
    x = 1,292.72

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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.