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Finding the Fourth Proportional to 218,879.20, 328,318.80 and 85,715.20

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Solution

The fourth proportional to 218,879.20, 328,318.80 and 85,715.20 is: 128,572.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,879.20 : 328,318.80 = 85,715.20 : x
  2. Step 2: Convert to fraction form
    218,879.20/328,318.80 = 85,715.20/x
  3. Step 3: Cross multiply
    218,879.20x = 328,318.80 × 85,715.20
  4. Step 4: Simplify right side
    218,879.20x = 28,141,911,605.76
  5. Step 5: Solve for x
    x = 28,141,911,605.76/218,879.20
  6. Step 6: Final answer
    x = 128,572.80

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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.