Home / 21,731.72-29,988.30-12,299.72

Finding the Fourth Proportional to 21,731.72, 29,988.30 and 12,299.72

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Solution

The fourth proportional to 21,731.72, 29,988.30 and 12,299.72 is: 16,972.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,731.72 : 29,988.30 = 12,299.72 : x
  2. Step 2: Convert to fraction form
    21,731.72/29,988.30 = 12,299.72/x
  3. Step 3: Cross multiply
    21,731.72x = 29,988.30 × 12,299.72
  4. Step 4: Simplify right side
    21,731.72x = 368,847,693.28
  5. Step 5: Solve for x
    x = 368,847,693.28/21,731.72
  6. Step 6: Final answer
    x = 16,972.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.