Home / 128,525.10-192,787.65-81,285.90

Finding the Fourth Proportional to 128,525.10, 192,787.65 and 81,285.90

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Solution

The fourth proportional to 128,525.10, 192,787.65 and 81,285.90 is: 121,928.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,525.10 : 192,787.65 = 81,285.90 : x
  2. Step 2: Convert to fraction form
    128,525.10/192,787.65 = 81,285.90/x
  3. Step 3: Cross multiply
    128,525.10x = 192,787.65 × 81,285.90
  4. Step 4: Simplify right side
    128,525.10x = 15,670,917,639.14
  5. Step 5: Solve for x
    x = 15,670,917,639.14/128,525.10
  6. Step 6: Final answer
    x = 121,928.85

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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.