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Finding the Fourth Proportional to 100,764.88, 139,074.78 and 66,713.29

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Solution

The fourth proportional to 100,764.88, 139,074.78 and 66,713.29 is: 92,077.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,764.88 : 139,074.78 = 66,713.29 : x
  2. Step 2: Convert to fraction form
    100,764.88/139,074.78 = 66,713.29/x
  3. Step 3: Cross multiply
    100,764.88x = 139,074.78 × 66,713.29
  4. Step 4: Simplify right side
    100,764.88x = 9,278,136,129.83
  5. Step 5: Solve for x
    x = 9,278,136,129.83/100,764.88
  6. Step 6: Final answer
    x = 92,077.08

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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.