Home / 218,953.30-328,439.67-85,821.70

Finding the Fourth Proportional to 218,953.30, 328,439.67 and 85,821.70

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Solution

The fourth proportional to 218,953.30, 328,439.67 and 85,821.70 is: 128,736.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,953.30 : 328,439.67 = 85,821.70 : x
  2. Step 2: Convert to fraction form
    218,953.30/328,439.67 = 85,821.70/x
  3. Step 3: Cross multiply
    218,953.30x = 328,439.67 × 85,821.70
  4. Step 4: Simplify right side
    218,953.30x = 28,187,250,826.84
  5. Step 5: Solve for x
    x = 28,187,250,826.84/218,953.30
  6. Step 6: Final answer
    x = 128,736.36

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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.