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Finding the Fourth Proportional to 297.90, 410.40 and 286.65

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Solution

The fourth proportional to 297.90, 410.40 and 286.65 is: 394.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.90 : 410.40 = 286.65 : x
  2. Step 2: Convert to fraction form
    297.90/410.40 = 286.65/x
  3. Step 3: Cross multiply
    297.90x = 410.40 × 286.65
  4. Step 4: Simplify right side
    297.90x = 117,641.16
  5. Step 5: Solve for x
    x = 117,641.16/297.90
  6. Step 6: Final answer
    x = 394.90

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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.