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Finding the Fourth Proportional to 211.32, 315.59 and 170.55

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Solution

The fourth proportional to 211.32, 315.59 and 170.55 is: 254.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.32 : 315.59 = 170.55 : x
  2. Step 2: Convert to fraction form
    211.32/315.59 = 170.55/x
  3. Step 3: Cross multiply
    211.32x = 315.59 × 170.55
  4. Step 4: Simplify right side
    211.32x = 53,823.02
  5. Step 5: Solve for x
    x = 53,823.02/211.32
  6. Step 6: Final answer
    x = 254.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.