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Finding the Fourth Proportional to 139,397.84, 192,326.64 and 78,958.88

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Solution

The fourth proportional to 139,397.84, 192,326.64 and 78,958.88 is: 108,939.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,397.84 : 192,326.64 = 78,958.88 : x
  2. Step 2: Convert to fraction form
    139,397.84/192,326.64 = 78,958.88/x
  3. Step 3: Cross multiply
    139,397.84x = 192,326.64 × 78,958.88
  4. Step 4: Simplify right side
    139,397.84x = 15,185,896,088.56
  5. Step 5: Solve for x
    x = 15,185,896,088.56/139,397.84
  6. Step 6: Final answer
    x = 108,939.25

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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.