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Finding the Fourth Proportional to 221,081.90, 331,692.91 and 78,924.11

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Solution

The fourth proportional to 221,081.90, 331,692.91 and 78,924.11 is: 118,411.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,081.90 : 331,692.91 = 78,924.11 : x
  2. Step 2: Convert to fraction form
    221,081.90/331,692.91 = 78,924.11/x
  3. Step 3: Cross multiply
    221,081.90x = 331,692.91 × 78,924.11
  4. Step 4: Simplify right side
    221,081.90x = 26,178,565,859.29
  5. Step 5: Solve for x
    x = 26,178,565,859.29/221,081.90
  6. Step 6: Final answer
    x = 118,411.17

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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.