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Finding the Fourth Proportional to 205.15, 307.18 and 123.88

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Solution

The fourth proportional to 205.15, 307.18 and 123.88 is: 185.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.15 : 307.18 = 123.88 : x
  2. Step 2: Convert to fraction form
    205.15/307.18 = 123.88/x
  3. Step 3: Cross multiply
    205.15x = 307.18 × 123.88
  4. Step 4: Simplify right side
    205.15x = 38,053.46
  5. Step 5: Solve for x
    x = 38,053.46/205.15
  6. Step 6: Final answer
    x = 185.49

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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.