Home / 1,615.20-2,229.18-986.10

Finding the Fourth Proportional to 1,615.20, 2,229.18 and 986.10

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Solution

The fourth proportional to 1,615.20, 2,229.18 and 986.10 is: 1,360.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.20 : 2,229.18 = 986.10 : x
  2. Step 2: Convert to fraction form
    1,615.20/2,229.18 = 986.10/x
  3. Step 3: Cross multiply
    1,615.20x = 2,229.18 × 986.10
  4. Step 4: Simplify right side
    1,615.20x = 2,198,194.40
  5. Step 5: Solve for x
    x = 2,198,194.40/1,615.20
  6. Step 6: Final answer
    x = 1,360.94

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1.5x scale

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.