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Finding the Fourth Proportional to 81,351.87, 121,981.08 and 43,354.36

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Solution

The fourth proportional to 81,351.87, 121,981.08 and 43,354.36 is: 65,006.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,351.87 : 121,981.08 = 43,354.36 : x
  2. Step 2: Convert to fraction form
    81,351.87/121,981.08 = 43,354.36/x
  3. Step 3: Cross multiply
    81,351.87x = 121,981.08 × 43,354.36
  4. Step 4: Simplify right side
    81,351.87x = 5,288,411,655.51
  5. Step 5: Solve for x
    x = 5,288,411,655.51/81,351.87
  6. Step 6: Final answer
    x = 65,006.64

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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.