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Finding the Fourth Proportional to 170.88, 256.38 and 74.64

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Solution

The fourth proportional to 170.88, 256.38 and 74.64 is: 111.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.88 : 256.38 = 74.64 : x
  2. Step 2: Convert to fraction form
    170.88/256.38 = 74.64/x
  3. Step 3: Cross multiply
    170.88x = 256.38 × 74.64
  4. Step 4: Simplify right side
    170.88x = 19,136.20
  5. Step 5: Solve for x
    x = 19,136.20/170.88
  6. Step 6: Final answer
    x = 111.99

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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.