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Finding the Fourth Proportional to 218,611.70, 328,012.85 and 76,558.88

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Solution

The fourth proportional to 218,611.70, 328,012.85 and 76,558.88 is: 114,871.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,611.70 : 328,012.85 = 76,558.88 : x
  2. Step 2: Convert to fraction form
    218,611.70/328,012.85 = 76,558.88/x
  3. Step 3: Cross multiply
    218,611.70x = 328,012.85 × 76,558.88
  4. Step 4: Simplify right side
    218,611.70x = 25,112,294,398.75
  5. Step 5: Solve for x
    x = 25,112,294,398.75/218,611.70
  6. Step 6: Final answer
    x = 114,871.69

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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.