Home / 21,731.40-29,996.46-12,778.47

Finding the Fourth Proportional to 21,731.40, 29,996.46 and 12,778.47

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Solution

The fourth proportional to 21,731.40, 29,996.46 and 12,778.47 is: 17,638.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,731.40 : 29,996.46 = 12,778.47 : x
  2. Step 2: Convert to fraction form
    21,731.40/29,996.46 = 12,778.47/x
  3. Step 3: Cross multiply
    21,731.40x = 29,996.46 × 12,778.47
  4. Step 4: Simplify right side
    21,731.40x = 383,308,864.22
  5. Step 5: Solve for x
    x = 383,308,864.22/21,731.40
  6. Step 6: Final answer
    x = 17,638.48

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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.