Home / 128,359.20-192,279.60-72,890.40

Finding the Fourth Proportional to 128,359.20, 192,279.60 and 72,890.40

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Solution

The fourth proportional to 128,359.20, 192,279.60 and 72,890.40 is: 109,188.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,359.20 : 192,279.60 = 72,890.40 : x
  2. Step 2: Convert to fraction form
    128,359.20/192,279.60 = 72,890.40/x
  3. Step 3: Cross multiply
    128,359.20x = 192,279.60 × 72,890.40
  4. Step 4: Simplify right side
    128,359.20x = 14,015,336,955.84
  5. Step 5: Solve for x
    x = 14,015,336,955.84/128,359.20
  6. Step 6: Final answer
    x = 109,188.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.