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Finding the Fourth Proportional to 221,095.69, 331,713.61 and 78,937.85

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Solution

The fourth proportional to 221,095.69, 331,713.61 and 78,937.85 is: 118,431.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,095.69 : 331,713.61 = 78,937.85 : x
  2. Step 2: Convert to fraction form
    221,095.69/331,713.61 = 78,937.85/x
  3. Step 3: Cross multiply
    221,095.69x = 331,713.61 × 78,937.85
  4. Step 4: Simplify right side
    221,095.69x = 26,184,759,821.08
  5. Step 5: Solve for x
    x = 26,184,759,821.08/221,095.69
  6. Step 6: Final answer
    x = 118,431.80

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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.