Home / 210,121.38-315,131.04-69,861.78

Finding the Fourth Proportional to 210,121.38, 315,131.04 and 69,861.78

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Solution

The fourth proportional to 210,121.38, 315,131.04 and 69,861.78 is: 104,775.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,121.38 : 315,131.04 = 69,861.78 : x
  2. Step 2: Convert to fraction form
    210,121.38/315,131.04 = 69,861.78/x
  3. Step 3: Cross multiply
    210,121.38x = 315,131.04 × 69,861.78
  4. Step 4: Simplify right side
    210,121.38x = 22,015,615,387.65
  5. Step 5: Solve for x
    x = 22,015,615,387.65/210,121.38
  6. Step 6: Final answer
    x = 104,775.70

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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.