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Finding the Fourth Proportional to 207,859.20, 312,019.20 and 129,062.40

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Solution

The fourth proportional to 207,859.20, 312,019.20 and 129,062.40 is: 193,736.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,859.20 : 312,019.20 = 129,062.40 : x
  2. Step 2: Convert to fraction form
    207,859.20/312,019.20 = 129,062.40/x
  3. Step 3: Cross multiply
    207,859.20x = 312,019.20 × 129,062.40
  4. Step 4: Simplify right side
    207,859.20x = 40,269,946,798.08
  5. Step 5: Solve for x
    x = 40,269,946,798.08/207,859.20
  6. Step 6: Final answer
    x = 193,736.66

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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.