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Finding the Fourth Proportional to 238.47, 328.77 and 208.65

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Solution

The fourth proportional to 238.47, 328.77 and 208.65 is: 287.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.47 : 328.77 = 208.65 : x
  2. Step 2: Convert to fraction form
    238.47/328.77 = 208.65/x
  3. Step 3: Cross multiply
    238.47x = 328.77 × 208.65
  4. Step 4: Simplify right side
    238.47x = 68,597.86
  5. Step 5: Solve for x
    x = 68,597.86/238.47
  6. Step 6: Final answer
    x = 287.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.