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Finding the Fourth Proportional to 221,001.20, 331,501.80 and 137,020.40

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Solution

The fourth proportional to 221,001.20, 331,501.80 and 137,020.40 is: 205,530.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,001.20 : 331,501.80 = 137,020.40 : x
  2. Step 2: Convert to fraction form
    221,001.20/331,501.80 = 137,020.40/x
  3. Step 3: Cross multiply
    221,001.20x = 331,501.80 × 137,020.40
  4. Step 4: Simplify right side
    221,001.20x = 45,422,509,236.72
  5. Step 5: Solve for x
    x = 45,422,509,236.72/221,001.20
  6. Step 6: Final answer
    x = 205,530.60

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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.