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Finding the Fourth Proportional to 207,860.20, 312,020.70 and 129,063.40

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Solution

The fourth proportional to 207,860.20, 312,020.70 and 129,063.40 is: 193,738.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,860.20 : 312,020.70 = 129,063.40 : x
  2. Step 2: Convert to fraction form
    207,860.20/312,020.70 = 129,063.40/x
  3. Step 3: Cross multiply
    207,860.20x = 312,020.70 × 129,063.40
  4. Step 4: Simplify right side
    207,860.20x = 40,270,452,412.38
  5. Step 5: Solve for x
    x = 40,270,452,412.38/207,860.20
  6. Step 6: Final answer
    x = 193,738.16

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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.