Home / 218,890.32-328,141.70-85,866.06

Finding the Fourth Proportional to 218,890.32, 328,141.70 and 85,866.06

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Solution

The fourth proportional to 218,890.32, 328,141.70 and 85,866.06 is: 128,723.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,890.32 : 328,141.70 = 85,866.06 : x
  2. Step 2: Convert to fraction form
    218,890.32/328,141.70 = 85,866.06/x
  3. Step 3: Cross multiply
    218,890.32x = 328,141.70 × 85,866.06
  4. Step 4: Simplify right side
    218,890.32x = 28,176,234,900.70
  5. Step 5: Solve for x
    x = 28,176,234,900.70/218,890.32
  6. Step 6: Final answer
    x = 128,723.07

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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.