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Finding the Fourth Proportional to 170,728.40, 255,766.20 and 91,816.40

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Solution

The fourth proportional to 170,728.40, 255,766.20 and 91,816.40 is: 137,549.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,728.40 : 255,766.20 = 91,816.40 : x
  2. Step 2: Convert to fraction form
    170,728.40/255,766.20 = 91,816.40/x
  3. Step 3: Cross multiply
    170,728.40x = 255,766.20 × 91,816.40
  4. Step 4: Simplify right side
    170,728.40x = 23,483,531,725.68
  5. Step 5: Solve for x
    x = 23,483,531,725.68/170,728.40
  6. Step 6: Final answer
    x = 137,549.06

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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.