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Finding the Fourth Proportional to 100,723.91, 139,002.38 and 55,403.80

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Solution

The fourth proportional to 100,723.91, 139,002.38 and 55,403.80 is: 76,459.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,723.91 : 139,002.38 = 55,403.80 : x
  2. Step 2: Convert to fraction form
    100,723.91/139,002.38 = 55,403.80/x
  3. Step 3: Cross multiply
    100,723.91x = 139,002.38 × 55,403.80
  4. Step 4: Simplify right side
    100,723.91x = 7,701,259,644.28
  5. Step 5: Solve for x
    x = 7,701,259,644.28/100,723.91
  6. Step 6: Final answer
    x = 76,459.11

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