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Finding the Fourth Proportional to 211.48, 317.05 and 124.81

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Solution

The fourth proportional to 211.48, 317.05 and 124.81 is: 187.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.48 : 317.05 = 124.81 : x
  2. Step 2: Convert to fraction form
    211.48/317.05 = 124.81/x
  3. Step 3: Cross multiply
    211.48x = 317.05 × 124.81
  4. Step 4: Simplify right side
    211.48x = 39,569.91
  5. Step 5: Solve for x
    x = 39,569.91/211.48
  6. Step 6: Final answer
    x = 187.11

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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.