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Finding the Fourth Proportional to 290.88, 400.80 and 279.52

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Solution

The fourth proportional to 290.88, 400.80 and 279.52 is: 385.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.88 : 400.80 = 279.52 : x
  2. Step 2: Convert to fraction form
    290.88/400.80 = 279.52/x
  3. Step 3: Cross multiply
    290.88x = 400.80 × 279.52
  4. Step 4: Simplify right side
    290.88x = 112,031.62
  5. Step 5: Solve for x
    x = 112,031.62/290.88
  6. Step 6: Final answer
    x = 385.15

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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.