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Finding the Fourth Proportional to 316.92, 437.14 and 290.78

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Solution

The fourth proportional to 316.92, 437.14 and 290.78 is: 401.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.92 : 437.14 = 290.78 : x
  2. Step 2: Convert to fraction form
    316.92/437.14 = 290.78/x
  3. Step 3: Cross multiply
    316.92x = 437.14 × 290.78
  4. Step 4: Simplify right side
    316.92x = 127,111.57
  5. Step 5: Solve for x
    x = 127,111.57/316.92
  6. Step 6: Final answer
    x = 401.08

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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.