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Finding the Fourth Proportional to 205.08, 307.08 and 139.93

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Solution

The fourth proportional to 205.08, 307.08 and 139.93 is: 209.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.08 : 307.08 = 139.93 : x
  2. Step 2: Convert to fraction form
    205.08/307.08 = 139.93/x
  3. Step 3: Cross multiply
    205.08x = 307.08 × 139.93
  4. Step 4: Simplify right side
    205.08x = 42,968.94
  5. Step 5: Solve for x
    x = 42,968.94/205.08
  6. Step 6: Final answer
    x = 209.52

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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.