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Finding the Fourth Proportional to 218,809.20, 328,213.86 and 69,061.17

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Solution

The fourth proportional to 218,809.20, 328,213.86 and 69,061.17 is: 103,591.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,809.20 : 328,213.86 = 69,061.17 : x
  2. Step 2: Convert to fraction form
    218,809.20/328,213.86 = 69,061.17/x
  3. Step 3: Cross multiply
    218,809.20x = 328,213.86 × 69,061.17
  4. Step 4: Simplify right side
    218,809.20x = 22,666,833,181.82
  5. Step 5: Solve for x
    x = 22,666,833,181.82/218,809.20
  6. Step 6: Final answer
    x = 103,591.77

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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.