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Finding the Fourth Proportional to 220,574.81, 330,820.00 and 85,638.87

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Solution

The fourth proportional to 220,574.81, 330,820.00 and 85,638.87 is: 128,441.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,574.81 : 330,820.00 = 85,638.87 : x
  2. Step 2: Convert to fraction form
    220,574.81/330,820.00 = 85,638.87/x
  3. Step 3: Cross multiply
    220,574.81x = 330,820.00 × 85,638.87
  4. Step 4: Simplify right side
    220,574.81x = 28,331,050,759.30
  5. Step 5: Solve for x
    x = 28,331,050,759.30/220,574.81
  6. Step 6: Final answer
    x = 128,441.91

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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.