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Finding the Fourth Proportional to 100,723.64, 139,005.78 and 66,672.68

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Solution

The fourth proportional to 100,723.64, 139,005.78 and 66,672.68 is: 92,013.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,723.64 : 139,005.78 = 66,672.68 : x
  2. Step 2: Convert to fraction form
    100,723.64/139,005.78 = 66,672.68/x
  3. Step 3: Cross multiply
    100,723.64x = 139,005.78 × 66,672.68
  4. Step 4: Simplify right side
    100,723.64x = 9,267,887,888.09
  5. Step 5: Solve for x
    x = 9,267,887,888.09/100,723.64
  6. Step 6: Final answer
    x = 92,013.04

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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.