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Finding the Fourth Proportional to 2,660.48, 3,990.36 and 928.88

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Solution

The fourth proportional to 2,660.48, 3,990.36 and 928.88 is: 1,393.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.48 : 3,990.36 = 928.88 : x
  2. Step 2: Convert to fraction form
    2,660.48/3,990.36 = 928.88/x
  3. Step 3: Cross multiply
    2,660.48x = 3,990.36 × 928.88
  4. Step 4: Simplify right side
    2,660.48x = 3,706,565.60
  5. Step 5: Solve for x
    x = 3,706,565.60/2,660.48
  6. Step 6: Final answer
    x = 1,393.19

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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.