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Finding the Fourth Proportional to 211.55, 317.12 and 103.41

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Solution

The fourth proportional to 211.55, 317.12 and 103.41 is: 155.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.55 : 317.12 = 103.41 : x
  2. Step 2: Convert to fraction form
    211.55/317.12 = 103.41/x
  3. Step 3: Cross multiply
    211.55x = 317.12 × 103.41
  4. Step 4: Simplify right side
    211.55x = 32,792.86
  5. Step 5: Solve for x
    x = 32,792.86/211.55
  6. Step 6: Final answer
    x = 155.02

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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.