Home / 128,376.16-177,163.92-71,787.40

Finding the Fourth Proportional to 128,376.16, 177,163.92 and 71,787.40

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Solution

The fourth proportional to 128,376.16, 177,163.92 and 71,787.40 is: 99,069.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,376.16 : 177,163.92 = 71,787.40 : x
  2. Step 2: Convert to fraction form
    128,376.16/177,163.92 = 71,787.40/x
  3. Step 3: Cross multiply
    128,376.16x = 177,163.92 × 71,787.40
  4. Step 4: Simplify right side
    128,376.16x = 12,718,137,190.61
  5. Step 5: Solve for x
    x = 12,718,137,190.61/128,376.16
  6. Step 6: Final answer
    x = 99,069.31

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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.