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Finding the Fourth Proportional to 170,428.80, 255,640.80 and 76,934.40

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Solution

The fourth proportional to 170,428.80, 255,640.80 and 76,934.40 is: 115,400.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,428.80 : 255,640.80 = 76,934.40 : x
  2. Step 2: Convert to fraction form
    170,428.80/255,640.80 = 76,934.40/x
  3. Step 3: Cross multiply
    170,428.80x = 255,640.80 × 76,934.40
  4. Step 4: Simplify right side
    170,428.80x = 19,667,571,563.52
  5. Step 5: Solve for x
    x = 19,667,571,563.52/170,428.80
  6. Step 6: Final answer
    x = 115,400.52

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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.