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Finding the Fourth Proportional to 139,809.42, 192,971.76 and 86,140.44

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Solution

The fourth proportional to 139,809.42, 192,971.76 and 86,140.44 is: 118,895.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,809.42 : 192,971.76 = 86,140.44 : x
  2. Step 2: Convert to fraction form
    139,809.42/192,971.76 = 86,140.44/x
  3. Step 3: Cross multiply
    139,809.42x = 192,971.76 × 86,140.44
  4. Step 4: Simplify right side
    139,809.42x = 16,622,672,313.97
  5. Step 5: Solve for x
    x = 16,622,672,313.97/139,809.42
  6. Step 6: Final answer
    x = 118,895.22

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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.