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Finding the Fourth Proportional to 100,706.44, 138,981.68 and 66,656.26

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Solution

The fourth proportional to 100,706.44, 138,981.68 and 66,656.26 is: 91,990.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,706.44 : 138,981.68 = 66,656.26 : x
  2. Step 2: Convert to fraction form
    100,706.44/138,981.68 = 66,656.26/x
  3. Step 3: Cross multiply
    100,706.44x = 138,981.68 × 66,656.26
  4. Step 4: Simplify right side
    100,706.44x = 9,263,998,997.32
  5. Step 5: Solve for x
    x = 9,263,998,997.32/100,706.44
  6. Step 6: Final answer
    x = 91,990.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.