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Finding the Fourth Proportional to 221,206.40, 331,809.60 and 81,065.60

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Solution

The fourth proportional to 221,206.40, 331,809.60 and 81,065.60 is: 121,598.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,206.40 : 331,809.60 = 81,065.60 : x
  2. Step 2: Convert to fraction form
    221,206.40/331,809.60 = 81,065.60/x
  3. Step 3: Cross multiply
    221,206.40x = 331,809.60 × 81,065.60
  4. Step 4: Simplify right side
    221,206.40x = 26,898,344,309.76
  5. Step 5: Solve for x
    x = 26,898,344,309.76/221,206.40
  6. Step 6: Final answer
    x = 121,598.40

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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.