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Finding the Fourth Proportional to 71,820, 99,109.60 and 39,988.88

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Solution

The fourth proportional to 71,820, 99,109.60 and 39,988.88 is: 55,183.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,820 : 99,109.60 = 39,988.88 : x
  2. Step 2: Convert to fraction form
    71,820/99,109.60 = 39,988.88/x
  3. Step 3: Cross multiply
    71,820x = 99,109.60 × 39,988.88
  4. Step 4: Simplify right side
    71,820x = 3,963,281,901.25
  5. Step 5: Solve for x
    x = 3,963,281,901.25/71,820
  6. Step 6: Final answer
    x = 55,183.54

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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.