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Finding the Fourth Proportional to 221,086.17, 331,699.34 and 78,928.35

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Solution

The fourth proportional to 221,086.17, 331,699.34 and 78,928.35 is: 118,417.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,086.17 : 331,699.34 = 78,928.35 : x
  2. Step 2: Convert to fraction form
    221,086.17/331,699.34 = 78,928.35/x
  3. Step 3: Cross multiply
    221,086.17x = 331,699.34 × 78,928.35
  4. Step 4: Simplify right side
    221,086.17x = 26,180,481,602.29
  5. Step 5: Solve for x
    x = 26,180,481,602.29/221,086.17
  6. Step 6: Final answer
    x = 118,417.55

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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.