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Finding the Fourth Proportional to 139,158.79, 192,039.18 and 78,728.20

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Solution

The fourth proportional to 139,158.79, 192,039.18 and 78,728.20 is: 108,644.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,158.79 : 192,039.18 = 78,728.20 : x
  2. Step 2: Convert to fraction form
    139,158.79/192,039.18 = 78,728.20/x
  3. Step 3: Cross multiply
    139,158.79x = 192,039.18 × 78,728.20
  4. Step 4: Simplify right side
    139,158.79x = 15,118,898,010.68
  5. Step 5: Solve for x
    x = 15,118,898,010.68/139,158.79
  6. Step 6: Final answer
    x = 108,644.94

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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.