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Finding the Fourth Proportional to 217,138.80, 325,740.60 and 76,886.40

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Solution

The fourth proportional to 217,138.80, 325,740.60 and 76,886.40 is: 115,341.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,138.80 : 325,740.60 = 76,886.40 : x
  2. Step 2: Convert to fraction form
    217,138.80/325,740.60 = 76,886.40/x
  3. Step 3: Cross multiply
    217,138.80x = 325,740.60 × 76,886.40
  4. Step 4: Simplify right side
    217,138.80x = 25,045,022,067.84
  5. Step 5: Solve for x
    x = 25,045,022,067.84/217,138.80
  6. Step 6: Final answer
    x = 115,341.07

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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.