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Finding the Fourth Proportional to 221,309.20, 331,526.40 and 121,290.40

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Solution

The fourth proportional to 221,309.20, 331,526.40 and 121,290.40 is: 181,695.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,309.20 : 331,526.40 = 121,290.40 : x
  2. Step 2: Convert to fraction form
    221,309.20/331,526.40 = 121,290.40/x
  3. Step 3: Cross multiply
    221,309.20x = 331,526.40 × 121,290.40
  4. Step 4: Simplify right side
    221,309.20x = 40,210,969,666.56
  5. Step 5: Solve for x
    x = 40,210,969,666.56/221,309.20
  6. Step 6: Final answer
    x = 181,695.88

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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.