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Finding the Fourth Proportional to 316.20, 474.36 and 194.40

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Solution

The fourth proportional to 316.20, 474.36 and 194.40 is: 291.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.20 : 474.36 = 194.40 : x
  2. Step 2: Convert to fraction form
    316.20/474.36 = 194.40/x
  3. Step 3: Cross multiply
    316.20x = 474.36 × 194.40
  4. Step 4: Simplify right side
    316.20x = 92,215.58
  5. Step 5: Solve for x
    x = 92,215.58/316.20
  6. Step 6: Final answer
    x = 291.64

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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.