Home / 2,160.20-3,240.14-861.76

Finding the Fourth Proportional to 2,160.20, 3,240.14 and 861.76

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Solution

The fourth proportional to 2,160.20, 3,240.14 and 861.76 is: 1,292.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.20 : 3,240.14 = 861.76 : x
  2. Step 2: Convert to fraction form
    2,160.20/3,240.14 = 861.76/x
  3. Step 3: Cross multiply
    2,160.20x = 3,240.14 × 861.76
  4. Step 4: Simplify right side
    2,160.20x = 2,792,223.05
  5. Step 5: Solve for x
    x = 2,792,223.05/2,160.20
  6. Step 6: Final answer
    x = 1,292.58

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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.