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Finding the Fourth Proportional to 165,909.80, 248,688.66 and 81,551

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Solution

The fourth proportional to 165,909.80, 248,688.66 and 81,551 is: 122,239.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    165,909.80 : 248,688.66 = 81,551 : x
  2. Step 2: Convert to fraction form
    165,909.80/248,688.66 = 81,551/x
  3. Step 3: Cross multiply
    165,909.80x = 248,688.66 × 81,551
  4. Step 4: Simplify right side
    165,909.80x = 20,280,808,911.66
  5. Step 5: Solve for x
    x = 20,280,808,911.66/165,909.80
  6. Step 6: Final answer
    x = 122,239.97

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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.