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Finding the Fourth Proportional to 290.32, 397.77 and 286.47

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Solution

The fourth proportional to 290.32, 397.77 and 286.47 is: 392.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.32 : 397.77 = 286.47 : x
  2. Step 2: Convert to fraction form
    290.32/397.77 = 286.47/x
  3. Step 3: Cross multiply
    290.32x = 397.77 × 286.47
  4. Step 4: Simplify right side
    290.32x = 113,949.17
  5. Step 5: Solve for x
    x = 113,949.17/290.32
  6. Step 6: Final answer
    x = 392.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.