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Finding the Fourth Proportional to 2,119.20, 3,180 and 887.76

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Solution

The fourth proportional to 2,119.20, 3,180 and 887.76 is: 1,332.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.20 : 3,180 = 887.76 : x
  2. Step 2: Convert to fraction form
    2,119.20/3,180 = 887.76/x
  3. Step 3: Cross multiply
    2,119.20x = 3,180 × 887.76
  4. Step 4: Simplify right side
    2,119.20x = 2,823,076.80
  5. Step 5: Solve for x
    x = 2,823,076.80/2,119.20
  6. Step 6: Final answer
    x = 1,332.14

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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.