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Finding the Fourth Proportional to 296.98, 408.36 and 287.86

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Solution

The fourth proportional to 296.98, 408.36 and 287.86 is: 395.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    296.98 : 408.36 = 287.86 : x
  2. Step 2: Convert to fraction form
    296.98/408.36 = 287.86/x
  3. Step 3: Cross multiply
    296.98x = 408.36 × 287.86
  4. Step 4: Simplify right side
    296.98x = 117,550.51
  5. Step 5: Solve for x
    x = 117,550.51/296.98
  6. Step 6: Final answer
    x = 395.82

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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.