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Finding the Fourth Proportional to 170.66, 256.08 and 145.28

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Solution

The fourth proportional to 170.66, 256.08 and 145.28 is: 218.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.66 : 256.08 = 145.28 : x
  2. Step 2: Convert to fraction form
    170.66/256.08 = 145.28/x
  3. Step 3: Cross multiply
    170.66x = 256.08 × 145.28
  4. Step 4: Simplify right side
    170.66x = 37,203.30
  5. Step 5: Solve for x
    x = 37,203.30/170.66
  6. Step 6: Final answer
    x = 218.00

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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.