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Finding the Fourth Proportional to 170.85, 256.32 and 128.07

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Solution

The fourth proportional to 170.85, 256.32 and 128.07 is: 192.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.85 : 256.32 = 128.07 : x
  2. Step 2: Convert to fraction form
    170.85/256.32 = 128.07/x
  3. Step 3: Cross multiply
    170.85x = 256.32 × 128.07
  4. Step 4: Simplify right side
    170.85x = 32,826.90
  5. Step 5: Solve for x
    x = 32,826.90/170.85
  6. Step 6: Final answer
    x = 192.14

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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.