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Finding the Fourth Proportional to 211.48, 317.04 and 139.12

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Solution

The fourth proportional to 211.48, 317.04 and 139.12 is: 208.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.48 : 317.04 = 139.12 : x
  2. Step 2: Convert to fraction form
    211.48/317.04 = 139.12/x
  3. Step 3: Cross multiply
    211.48x = 317.04 × 139.12
  4. Step 4: Simplify right side
    211.48x = 44,106.60
  5. Step 5: Solve for x
    x = 44,106.60/211.48
  6. Step 6: Final answer
    x = 208.56

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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.