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Finding the Fourth Proportional to 139,228.07, 192,101.80 and 78,798.71

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Solution

The fourth proportional to 139,228.07, 192,101.80 and 78,798.71 is: 108,723.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,228.07 : 192,101.80 = 78,798.71 : x
  2. Step 2: Convert to fraction form
    139,228.07/192,101.80 = 78,798.71/x
  3. Step 3: Cross multiply
    139,228.07x = 192,101.80 × 78,798.71
  4. Step 4: Simplify right side
    139,228.07x = 15,137,374,177.96
  5. Step 5: Solve for x
    x = 15,137,374,177.96/139,228.07
  6. Step 6: Final answer
    x = 108,723.58

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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.