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Finding the Fourth Proportional to 100,723.03, 139,009.61 and 57,716.45

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Solution

The fourth proportional to 100,723.03, 139,009.61 and 57,716.45 is: 79,655.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,723.03 : 139,009.61 = 57,716.45 : x
  2. Step 2: Convert to fraction form
    100,723.03/139,009.61 = 57,716.45/x
  3. Step 3: Cross multiply
    100,723.03x = 139,009.61 × 57,716.45
  4. Step 4: Simplify right side
    100,723.03x = 8,023,141,205.08
  5. Step 5: Solve for x
    x = 8,023,141,205.08/100,723.03
  6. Step 6: Final answer
    x = 79,655.48

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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.