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Finding the Fourth Proportional to 2,660.65, 3,990.16 and 928.87

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Solution

The fourth proportional to 2,660.65, 3,990.16 and 928.87 is: 1,393.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.65 : 3,990.16 = 928.87 : x
  2. Step 2: Convert to fraction form
    2,660.65/3,990.16 = 928.87/x
  3. Step 3: Cross multiply
    2,660.65x = 3,990.16 × 928.87
  4. Step 4: Simplify right side
    2,660.65x = 3,706,331.10
  5. Step 5: Solve for x
    x = 3,706,331.10/2,660.65
  6. Step 6: Final answer
    x = 1,393.02

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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.