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Finding the Fourth Proportional to 139,159, 192,039.36 and 78,728.40

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Solution

The fourth proportional to 139,159, 192,039.36 and 78,728.40 is: 108,645.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,159 : 192,039.36 = 78,728.40 : x
  2. Step 2: Convert to fraction form
    139,159/192,039.36 = 78,728.40/x
  3. Step 3: Cross multiply
    139,159x = 192,039.36 × 78,728.40
  4. Step 4: Simplify right side
    139,159x = 15,118,951,549.82
  5. Step 5: Solve for x
    x = 15,118,951,549.82/139,159
  6. Step 6: Final answer
    x = 108,645.16

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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.