Home / 128,376.20-192,305.10-72,907.40

Finding the Fourth Proportional to 128,376.20, 192,305.10 and 72,907.40

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Solution

The fourth proportional to 128,376.20, 192,305.10 and 72,907.40 is: 109,213.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,376.20 : 192,305.10 = 72,907.40 : x
  2. Step 2: Convert to fraction form
    128,376.20/192,305.10 = 72,907.40/x
  3. Step 3: Cross multiply
    128,376.20x = 192,305.10 × 72,907.40
  4. Step 4: Simplify right side
    128,376.20x = 14,020,464,847.74
  5. Step 5: Solve for x
    x = 14,020,464,847.74/128,376.20
  6. Step 6: Final answer
    x = 109,213.90

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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.