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Finding the Fourth Proportional to 206,839.40, 310,259.10 and 135,980.60

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Solution

The fourth proportional to 206,839.40, 310,259.10 and 135,980.60 is: 203,970.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,839.40 : 310,259.10 = 135,980.60 : x
  2. Step 2: Convert to fraction form
    206,839.40/310,259.10 = 135,980.60/x
  3. Step 3: Cross multiply
    206,839.40x = 310,259.10 × 135,980.60
  4. Step 4: Simplify right side
    206,839.40x = 42,189,218,573.46
  5. Step 5: Solve for x
    x = 42,189,218,573.46/206,839.40
  6. Step 6: Final answer
    x = 203,970.90

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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.