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Finding the Fourth Proportional to 165,212.80, 247,624.80 and 86,286.40

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Solution

The fourth proportional to 165,212.80, 247,624.80 and 86,286.40 is: 129,328.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    165,212.80 : 247,624.80 = 86,286.40 : x
  2. Step 2: Convert to fraction form
    165,212.80/247,624.80 = 86,286.40/x
  3. Step 3: Cross multiply
    165,212.80x = 247,624.80 × 86,286.40
  4. Step 4: Simplify right side
    165,212.80x = 21,366,652,542.72
  5. Step 5: Solve for x
    x = 21,366,652,542.72/165,212.80
  6. Step 6: Final answer
    x = 129,328.07

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1.5x scale

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.