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Finding the Fourth Proportional to 170.66, 256.08 and 79.40

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Solution

The fourth proportional to 170.66, 256.08 and 79.40 is: 119.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.66 : 256.08 = 79.40 : x
  2. Step 2: Convert to fraction form
    170.66/256.08 = 79.40/x
  3. Step 3: Cross multiply
    170.66x = 256.08 × 79.40
  4. Step 4: Simplify right side
    170.66x = 20,332.75
  5. Step 5: Solve for x
    x = 20,332.75/170.66
  6. Step 6: Final answer
    x = 119.14

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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.