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Finding the Fourth Proportional to 2,660.10, 3,990.16 and 928.32

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Solution

The fourth proportional to 2,660.10, 3,990.16 and 928.32 is: 1,392.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.10 : 3,990.16 = 928.32 : x
  2. Step 2: Convert to fraction form
    2,660.10/3,990.16 = 928.32/x
  3. Step 3: Cross multiply
    2,660.10x = 3,990.16 × 928.32
  4. Step 4: Simplify right side
    2,660.10x = 3,704,145.33
  5. Step 5: Solve for x
    x = 3,704,145.33/2,660.10
  6. Step 6: Final answer
    x = 1,392.48

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Similar ratio
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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.