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Finding the Fourth Proportional to 78,127.49, 117,346.90 and 73,721.10

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Solution

The fourth proportional to 78,127.49, 117,346.90 and 73,721.10 is: 110,728.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,127.49 : 117,346.90 = 73,721.10 : x
  2. Step 2: Convert to fraction form
    78,127.49/117,346.90 = 73,721.10/x
  3. Step 3: Cross multiply
    78,127.49x = 117,346.90 × 73,721.10
  4. Step 4: Simplify right side
    78,127.49x = 8,650,942,365.29
  5. Step 5: Solve for x
    x = 8,650,942,365.29/78,127.49
  6. Step 6: Final answer
    x = 110,728.54

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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.