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Finding the Fourth Proportional to 356.08, 491.20 and 245.61

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Solution

The fourth proportional to 356.08, 491.20 and 245.61 is: 338.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.08 : 491.20 = 245.61 : x
  2. Step 2: Convert to fraction form
    356.08/491.20 = 245.61/x
  3. Step 3: Cross multiply
    356.08x = 491.20 × 245.61
  4. Step 4: Simplify right side
    356.08x = 120,643.63
  5. Step 5: Solve for x
    x = 120,643.63/356.08
  6. Step 6: Final answer
    x = 338.81

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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.