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Finding the Fourth Proportional to 71,910.76, 107,866.05 and 19,320.25

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Solution

The fourth proportional to 71,910.76, 107,866.05 and 19,320.25 is: 28,980.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,910.76 : 107,866.05 = 19,320.25 : x
  2. Step 2: Convert to fraction form
    71,910.76/107,866.05 = 19,320.25/x
  3. Step 3: Cross multiply
    71,910.76x = 107,866.05 × 19,320.25
  4. Step 4: Simplify right side
    71,910.76x = 2,083,998,772.29
  5. Step 5: Solve for x
    x = 2,083,998,772.29/71,910.76
  6. Step 6: Final answer
    x = 28,980.35

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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.