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Finding the Fourth Proportional to 21,750.96, 29,999.70 and 18,731.31

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Solution

The fourth proportional to 21,750.96, 29,999.70 and 18,731.31 is: 25,834.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,750.96 : 29,999.70 = 18,731.31 : x
  2. Step 2: Convert to fraction form
    21,750.96/29,999.70 = 18,731.31/x
  3. Step 3: Cross multiply
    21,750.96x = 29,999.70 × 18,731.31
  4. Step 4: Simplify right side
    21,750.96x = 561,933,680.61
  5. Step 5: Solve for x
    x = 561,933,680.61/21,750.96
  6. Step 6: Final answer
    x = 25,834.89

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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.