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Finding the Fourth Proportional to 170,422.80, 255,631.80 and 76,928.40

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Solution

The fourth proportional to 170,422.80, 255,631.80 and 76,928.40 is: 115,391.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,422.80 : 255,631.80 = 76,928.40 : x
  2. Step 2: Convert to fraction form
    170,422.80/255,631.80 = 76,928.40/x
  3. Step 3: Cross multiply
    170,422.80x = 255,631.80 × 76,928.40
  4. Step 4: Simplify right side
    170,422.80x = 19,665,345,363.12
  5. Step 5: Solve for x
    x = 19,665,345,363.12/170,422.80
  6. Step 6: Final answer
    x = 115,391.52

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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.