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Finding the Fourth Proportional to 139,320.68, 192,251.88 and 81,962.28

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Solution

The fourth proportional to 139,320.68, 192,251.88 and 81,962.28 is: 113,101.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,320.68 : 192,251.88 = 81,962.28 : x
  2. Step 2: Convert to fraction form
    139,320.68/192,251.88 = 81,962.28/x
  3. Step 3: Cross multiply
    139,320.68x = 192,251.88 × 81,962.28
  4. Step 4: Simplify right side
    139,320.68x = 15,757,402,419.09
  5. Step 5: Solve for x
    x = 15,757,402,419.09/139,320.68
  6. Step 6: Final answer
    x = 113,101.68

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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.