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Finding the Fourth Proportional to 316.79, 474.41 and 186.40

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Solution

The fourth proportional to 316.79, 474.41 and 186.40 is: 279.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.79 : 474.41 = 186.40 : x
  2. Step 2: Convert to fraction form
    316.79/474.41 = 186.40/x
  3. Step 3: Cross multiply
    316.79x = 474.41 × 186.40
  4. Step 4: Simplify right side
    316.79x = 88,427.91
  5. Step 5: Solve for x
    x = 88,427.91/316.79
  6. Step 6: Final answer
    x = 279.14

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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.