Home / 7,681.20-11,521.80-2,487.60

Finding the Fourth Proportional to 7,681.20, 11,521.80 and 2,487.60

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Solution

The fourth proportional to 7,681.20, 11,521.80 and 2,487.60 is: 3,731.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,681.20 : 11,521.80 = 2,487.60 : x
  2. Step 2: Convert to fraction form
    7,681.20/11,521.80 = 2,487.60/x
  3. Step 3: Cross multiply
    7,681.20x = 11,521.80 × 2,487.60
  4. Step 4: Simplify right side
    7,681.20x = 28,661,629.68
  5. Step 5: Solve for x
    x = 28,661,629.68/7,681.20
  6. Step 6: Final answer
    x = 3,731.40

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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.