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Finding the Fourth Proportional to 221,339.79, 331,812.45 and 81,065.61

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Solution

The fourth proportional to 221,339.79, 331,812.45 and 81,065.61 is: 121,526.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,339.79 : 331,812.45 = 81,065.61 : x
  2. Step 2: Convert to fraction form
    221,339.79/331,812.45 = 81,065.61/x
  3. Step 3: Cross multiply
    221,339.79x = 331,812.45 × 81,065.61
  4. Step 4: Simplify right side
    221,339.79x = 26,898,578,664.84
  5. Step 5: Solve for x
    x = 26,898,578,664.84/221,339.79
  6. Step 6: Final answer
    x = 121,526.18

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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.