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Finding the Fourth Proportional to 2,660.72, 3,991.07 and 928.94

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Solution

The fourth proportional to 2,660.72, 3,991.07 and 928.94 is: 1,393.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.72 : 3,991.07 = 928.94 : x
  2. Step 2: Convert to fraction form
    2,660.72/3,991.07 = 928.94/x
  3. Step 3: Cross multiply
    2,660.72x = 3,991.07 × 928.94
  4. Step 4: Simplify right side
    2,660.72x = 3,707,446.93
  5. Step 5: Solve for x
    x = 3,707,446.93/2,660.72
  6. Step 6: Final answer
    x = 1,393.40

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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.