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Finding the Fourth Proportional to 149,643.65, 206,512.64 and 81,665.03

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Solution

The fourth proportional to 149,643.65, 206,512.64 and 81,665.03 is: 112,700.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,643.65 : 206,512.64 = 81,665.03 : x
  2. Step 2: Convert to fraction form
    149,643.65/206,512.64 = 81,665.03/x
  3. Step 3: Cross multiply
    149,643.65x = 206,512.64 × 81,665.03
  4. Step 4: Simplify right side
    149,643.65x = 16,864,859,500.09
  5. Step 5: Solve for x
    x = 16,864,859,500.09/149,643.65
  6. Step 6: Final answer
    x = 112,700.14

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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.