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Finding the Fourth Proportional to 316.95, 474.70 and 188.43

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Solution

The fourth proportional to 316.95, 474.70 and 188.43 is: 282.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.95 : 474.70 = 188.43 : x
  2. Step 2: Convert to fraction form
    316.95/474.70 = 188.43/x
  3. Step 3: Cross multiply
    316.95x = 474.70 × 188.43
  4. Step 4: Simplify right side
    316.95x = 89,447.72
  5. Step 5: Solve for x
    x = 89,447.72/316.95
  6. Step 6: Final answer
    x = 282.21

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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.