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Finding the Fourth Proportional to 170.65, 256.90 and 155.53

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Solution

The fourth proportional to 170.65, 256.90 and 155.53 is: 234.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.65 : 256.90 = 155.53 : x
  2. Step 2: Convert to fraction form
    170.65/256.90 = 155.53/x
  3. Step 3: Cross multiply
    170.65x = 256.90 × 155.53
  4. Step 4: Simplify right side
    170.65x = 39,955.66
  5. Step 5: Solve for x
    x = 39,955.66/170.65
  6. Step 6: Final answer
    x = 234.14

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.