Home / 21,138.21-31,704.59-7,988.88

Finding the Fourth Proportional to 21,138.21, 31,704.59 and 7,988.88

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Solution

The fourth proportional to 21,138.21, 31,704.59 and 7,988.88 is: 11,982.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.21 : 31,704.59 = 7,988.88 : x
  2. Step 2: Convert to fraction form
    21,138.21/31,704.59 = 7,988.88/x
  3. Step 3: Cross multiply
    21,138.21x = 31,704.59 × 7,988.88
  4. Step 4: Simplify right side
    21,138.21x = 253,283,966.49
  5. Step 5: Solve for x
    x = 253,283,966.49/21,138.21
  6. Step 6: Final answer
    x = 11,982.28

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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.