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Finding the Fourth Proportional to 218,787.32, 328,236.32 and 61,015.80

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Solution

The fourth proportional to 218,787.32, 328,236.32 and 61,015.80 is: 91,539.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,787.32 : 328,236.32 = 61,015.80 : x
  2. Step 2: Convert to fraction form
    218,787.32/328,236.32 = 61,015.80/x
  3. Step 3: Cross multiply
    218,787.32x = 328,236.32 × 61,015.80
  4. Step 4: Simplify right side
    218,787.32x = 20,027,601,653.86
  5. Step 5: Solve for x
    x = 20,027,601,653.86/218,787.32
  6. Step 6: Final answer
    x = 91,539.13

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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.