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Finding the Fourth Proportional to 71,720.64, 107,578.21 and 19,129.67

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Solution

The fourth proportional to 71,720.64, 107,578.21 and 19,129.67 is: 28,693.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,720.64 : 107,578.21 = 19,129.67 : x
  2. Step 2: Convert to fraction form
    71,720.64/107,578.21 = 19,129.67/x
  3. Step 3: Cross multiply
    71,720.64x = 107,578.21 × 19,129.67
  4. Step 4: Simplify right side
    71,720.64x = 2,057,935,656.49
  5. Step 5: Solve for x
    x = 2,057,935,656.49/71,720.64
  6. Step 6: Final answer
    x = 28,693.77

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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.