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Finding the Fourth Proportional to 170.90, 256.43 and 79.70

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Solution

The fourth proportional to 170.90, 256.43 and 79.70 is: 119.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.90 : 256.43 = 79.70 : x
  2. Step 2: Convert to fraction form
    170.90/256.43 = 79.70/x
  3. Step 3: Cross multiply
    170.90x = 256.43 × 79.70
  4. Step 4: Simplify right side
    170.90x = 20,437.47
  5. Step 5: Solve for x
    x = 20,437.47/170.90
  6. Step 6: Final answer
    x = 119.59

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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.