Home / 21,002.31-31,497.30-7,851.60

Finding the Fourth Proportional to 21,002.31, 31,497.30 and 7,851.60

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Solution

The fourth proportional to 21,002.31, 31,497.30 and 7,851.60 is: 11,775.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,002.31 : 31,497.30 = 7,851.60 : x
  2. Step 2: Convert to fraction form
    21,002.31/31,497.30 = 7,851.60/x
  3. Step 3: Cross multiply
    21,002.31x = 31,497.30 × 7,851.60
  4. Step 4: Simplify right side
    21,002.31x = 247,304,200.68
  5. Step 5: Solve for x
    x = 247,304,200.68/21,002.31
  6. Step 6: Final answer
    x = 11,775.10

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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.