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Finding the Fourth Proportional to 353.88, 488.16 and 288.72

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Solution

The fourth proportional to 353.88, 488.16 and 288.72 is: 398.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.88 : 488.16 = 288.72 : x
  2. Step 2: Convert to fraction form
    353.88/488.16 = 288.72/x
  3. Step 3: Cross multiply
    353.88x = 488.16 × 288.72
  4. Step 4: Simplify right side
    353.88x = 140,941.56
  5. Step 5: Solve for x
    x = 140,941.56/353.88
  6. Step 6: Final answer
    x = 398.27

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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.