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Finding the Fourth Proportional to 2,660.40, 3,985.20 and 1,504.80

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Solution

The fourth proportional to 2,660.40, 3,985.20 and 1,504.80 is: 2,254.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.40 : 3,985.20 = 1,504.80 : x
  2. Step 2: Convert to fraction form
    2,660.40/3,985.20 = 1,504.80/x
  3. Step 3: Cross multiply
    2,660.40x = 3,985.20 × 1,504.80
  4. Step 4: Simplify right side
    2,660.40x = 5,996,928.96
  5. Step 5: Solve for x
    x = 5,996,928.96/2,660.40
  6. Step 6: Final answer
    x = 2,254.15

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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.