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Finding the Fourth Proportional to 220,991.20, 331,486.80 and 137,010.40

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Solution

The fourth proportional to 220,991.20, 331,486.80 and 137,010.40 is: 205,515.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,991.20 : 331,486.80 = 137,010.40 : x
  2. Step 2: Convert to fraction form
    220,991.20/331,486.80 = 137,010.40/x
  3. Step 3: Cross multiply
    220,991.20x = 331,486.80 × 137,010.40
  4. Step 4: Simplify right side
    220,991.20x = 45,417,139,062.72
  5. Step 5: Solve for x
    x = 45,417,139,062.72/220,991.20
  6. Step 6: Final answer
    x = 205,515.60

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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.