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Finding the Fourth Proportional to 170,659.90, 256,147.08 and 86,479.70

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Solution

The fourth proportional to 170,659.90, 256,147.08 and 86,479.70 is: 129,799.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,659.90 : 256,147.08 = 86,479.70 : x
  2. Step 2: Convert to fraction form
    170,659.90/256,147.08 = 86,479.70/x
  3. Step 3: Cross multiply
    170,659.90x = 256,147.08 × 86,479.70
  4. Step 4: Simplify right side
    170,659.90x = 22,151,521,029.24
  5. Step 5: Solve for x
    x = 22,151,521,029.24/170,659.90
  6. Step 6: Final answer
    x = 129,799.21

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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.