Home / 21,326.20-31,989.30-12,869.80

Finding the Fourth Proportional to 21,326.20, 31,989.30 and 12,869.80

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Solution

The fourth proportional to 21,326.20, 31,989.30 and 12,869.80 is: 19,304.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,326.20 : 31,989.30 = 12,869.80 : x
  2. Step 2: Convert to fraction form
    21,326.20/31,989.30 = 12,869.80/x
  3. Step 3: Cross multiply
    21,326.20x = 31,989.30 × 12,869.80
  4. Step 4: Simplify right side
    21,326.20x = 411,695,893.14
  5. Step 5: Solve for x
    x = 411,695,893.14/21,326.20
  6. Step 6: Final answer
    x = 19,304.70

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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.