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Finding the Fourth Proportional to 109,905.70, 164,858.55 and 65,618.95

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Solution

The fourth proportional to 109,905.70, 164,858.55 and 65,618.95 is: 98,428.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,905.70 : 164,858.55 = 65,618.95 : x
  2. Step 2: Convert to fraction form
    109,905.70/164,858.55 = 65,618.95/x
  3. Step 3: Cross multiply
    109,905.70x = 164,858.55 × 65,618.95
  4. Step 4: Simplify right side
    109,905.70x = 10,817,844,949.52
  5. Step 5: Solve for x
    x = 10,817,844,949.52/109,905.70
  6. Step 6: Final answer
    x = 98,428.43

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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.