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Finding the Fourth Proportional to 290.24, 397.61 and 279.72

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Solution

The fourth proportional to 290.24, 397.61 and 279.72 is: 383.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.24 : 397.61 = 279.72 : x
  2. Step 2: Convert to fraction form
    290.24/397.61 = 279.72/x
  3. Step 3: Cross multiply
    290.24x = 397.61 × 279.72
  4. Step 4: Simplify right side
    290.24x = 111,219.47
  5. Step 5: Solve for x
    x = 111,219.47/290.24
  6. Step 6: Final answer
    x = 383.20

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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.