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Finding the Fourth Proportional to 139,054.92, 191,884.32 and 78,631.74

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Solution

The fourth proportional to 139,054.92, 191,884.32 and 78,631.74 is: 108,505.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,054.92 : 191,884.32 = 78,631.74 : x
  2. Step 2: Convert to fraction form
    139,054.92/191,884.32 = 78,631.74/x
  3. Step 3: Cross multiply
    139,054.92x = 191,884.32 × 78,631.74
  4. Step 4: Simplify right side
    139,054.92x = 15,088,197,960.32
  5. Step 5: Solve for x
    x = 15,088,197,960.32/139,054.92
  6. Step 6: Final answer
    x = 108,505.32

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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.