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Finding the Fourth Proportional to 206,939.80, 310,409.70 and 66,712.60

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Solution

The fourth proportional to 206,939.80, 310,409.70 and 66,712.60 is: 100,068.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,939.80 : 310,409.70 = 66,712.60 : x
  2. Step 2: Convert to fraction form
    206,939.80/310,409.70 = 66,712.60/x
  3. Step 3: Cross multiply
    206,939.80x = 310,409.70 × 66,712.60
  4. Step 4: Simplify right side
    206,939.80x = 20,708,238,152.22
  5. Step 5: Solve for x
    x = 20,708,238,152.22/206,939.80
  6. Step 6: Final answer
    x = 100,068.90

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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.