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Finding the Fourth Proportional to 211.20, 316.95 and 124.57

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Solution

The fourth proportional to 211.20, 316.95 and 124.57 is: 186.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.20 : 316.95 = 124.57 : x
  2. Step 2: Convert to fraction form
    211.20/316.95 = 124.57/x
  3. Step 3: Cross multiply
    211.20x = 316.95 × 124.57
  4. Step 4: Simplify right side
    211.20x = 39,482.46
  5. Step 5: Solve for x
    x = 39,482.46/211.20
  6. Step 6: Final answer
    x = 186.94

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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.