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Finding the Fourth Proportional to 139,334.28, 192,293.28 and 78,915.57

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Solution

The fourth proportional to 139,334.28, 192,293.28 and 78,915.57 is: 108,910.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,334.28 : 192,293.28 = 78,915.57 : x
  2. Step 2: Convert to fraction form
    139,334.28/192,293.28 = 78,915.57/x
  3. Step 3: Cross multiply
    139,334.28x = 192,293.28 × 78,915.57
  4. Step 4: Simplify right side
    139,334.28x = 15,174,933,798.37
  5. Step 5: Solve for x
    x = 15,174,933,798.37/139,334.28
  6. Step 6: Final answer
    x = 108,910.27

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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.