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Finding the Fourth Proportional to 139,365.15, 192,320.67 and 81,218.17

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Solution

The fourth proportional to 139,365.15, 192,320.67 and 81,218.17 is: 112,079.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,365.15 : 192,320.67 = 81,218.17 : x
  2. Step 2: Convert to fraction form
    139,365.15/192,320.67 = 81,218.17/x
  3. Step 3: Cross multiply
    139,365.15x = 192,320.67 × 81,218.17
  4. Step 4: Simplify right side
    139,365.15x = 15,619,933,415.54
  5. Step 5: Solve for x
    x = 15,619,933,415.54/139,365.15
  6. Step 6: Final answer
    x = 112,079.20

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1.5x scale

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.