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Finding the Fourth Proportional to 211.93, 317.48 and 139.57

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Solution

The fourth proportional to 211.93, 317.48 and 139.57 is: 209.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.93 : 317.48 = 139.57 : x
  2. Step 2: Convert to fraction form
    211.93/317.48 = 139.57/x
  3. Step 3: Cross multiply
    211.93x = 317.48 × 139.57
  4. Step 4: Simplify right side
    211.93x = 44,309.99
  5. Step 5: Solve for x
    x = 44,309.99/211.93
  6. Step 6: Final answer
    x = 209.08

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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.