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Finding the Fourth Proportional to 316.20, 474.38 and 186.31

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Solution

The fourth proportional to 316.20, 474.38 and 186.31 is: 279.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.20 : 474.38 = 186.31 : x
  2. Step 2: Convert to fraction form
    316.20/474.38 = 186.31/x
  3. Step 3: Cross multiply
    316.20x = 474.38 × 186.31
  4. Step 4: Simplify right side
    316.20x = 88,381.02
  5. Step 5: Solve for x
    x = 88,381.02/316.20
  6. Step 6: Final answer
    x = 279.51

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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.