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Finding the Fourth Proportional to 220,575.81, 330,821.50 and 85,639.87

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Solution

The fourth proportional to 220,575.81, 330,821.50 and 85,639.87 is: 128,443.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,575.81 : 330,821.50 = 85,639.87 : x
  2. Step 2: Convert to fraction form
    220,575.81/330,821.50 = 85,639.87/x
  3. Step 3: Cross multiply
    220,575.81x = 330,821.50 × 85,639.87
  4. Step 4: Simplify right side
    220,575.81x = 28,331,510,253.21
  5. Step 5: Solve for x
    x = 28,331,510,253.21/220,575.81
  6. Step 6: Final answer
    x = 128,443.41

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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.