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Finding the Fourth Proportional to 71,360.56, 107,013.20 and 21,428.88

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Solution

The fourth proportional to 71,360.56, 107,013.20 and 21,428.88 is: 32,135.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,360.56 : 107,013.20 = 21,428.88 : x
  2. Step 2: Convert to fraction form
    71,360.56/107,013.20 = 21,428.88/x
  3. Step 3: Cross multiply
    71,360.56x = 107,013.20 × 21,428.88
  4. Step 4: Simplify right side
    71,360.56x = 2,293,173,021.22
  5. Step 5: Solve for x
    x = 2,293,173,021.22/71,360.56
  6. Step 6: Final answer
    x = 32,135.02

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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.