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Finding the Fourth Proportional to 220,656.84, 330,942.78 and 85,720.74

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Solution

The fourth proportional to 220,656.84, 330,942.78 and 85,720.74 is: 128,564.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,656.84 : 330,942.78 = 85,720.74 : x
  2. Step 2: Convert to fraction form
    220,656.84/330,942.78 = 85,720.74/x
  3. Step 3: Cross multiply
    220,656.84x = 330,942.78 × 85,720.74
  4. Step 4: Simplify right side
    220,656.84x = 28,368,659,999.26
  5. Step 5: Solve for x
    x = 28,368,659,999.26/220,656.84
  6. Step 6: Final answer
    x = 128,564.61

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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.