Home / 128,160.10-192,131.10-78,275.18

Finding the Fourth Proportional to 128,160.10, 192,131.10 and 78,275.18

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Solution

The fourth proportional to 128,160.10, 192,131.10 and 78,275.18 is: 117,346.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,160.10 : 192,131.10 = 78,275.18 : x
  2. Step 2: Convert to fraction form
    128,160.10/192,131.10 = 78,275.18/x
  3. Step 3: Cross multiply
    128,160.10x = 192,131.10 × 78,275.18
  4. Step 4: Simplify right side
    128,160.10x = 15,039,096,436.10
  5. Step 5: Solve for x
    x = 15,039,096,436.10/128,160.10
  6. Step 6: Final answer
    x = 117,346.17

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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.