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Finding the Fourth Proportional to 139,387.70, 192,355.79 and 85,707.79

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Solution

The fourth proportional to 139,387.70, 192,355.79 and 85,707.79 is: 118,277.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,387.70 : 192,355.79 = 85,707.79 : x
  2. Step 2: Convert to fraction form
    139,387.70/192,355.79 = 85,707.79/x
  3. Step 3: Cross multiply
    139,387.70x = 192,355.79 × 85,707.79
  4. Step 4: Simplify right side
    139,387.70x = 16,486,388,745.18
  5. Step 5: Solve for x
    x = 16,486,388,745.18/139,387.70
  6. Step 6: Final answer
    x = 118,277.21

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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.