Home / 1,219.20-1,680.48-985.92

Finding the Fourth Proportional to 1,219.20, 1,680.48 and 985.92

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Solution

The fourth proportional to 1,219.20, 1,680.48 and 985.92 is: 1,358.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.20 : 1,680.48 = 985.92 : x
  2. Step 2: Convert to fraction form
    1,219.20/1,680.48 = 985.92/x
  3. Step 3: Cross multiply
    1,219.20x = 1,680.48 × 985.92
  4. Step 4: Simplify right side
    1,219.20x = 1,656,818.84
  5. Step 5: Solve for x
    x = 1,656,818.84/1,219.20
  6. Step 6: Final answer
    x = 1,358.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.