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Finding the Fourth Proportional to 71,748.82, 99,014.70 and 39,920.68

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Solution

The fourth proportional to 71,748.82, 99,014.70 and 39,920.68 is: 55,091.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,748.82 : 99,014.70 = 39,920.68 : x
  2. Step 2: Convert to fraction form
    71,748.82/99,014.70 = 39,920.68/x
  3. Step 3: Cross multiply
    71,748.82x = 99,014.70 × 39,920.68
  4. Step 4: Simplify right side
    71,748.82x = 3,952,734,154.00
  5. Step 5: Solve for x
    x = 3,952,734,154.00/71,748.82
  6. Step 6: Final answer
    x = 55,091.28

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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.