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Finding the Fourth Proportional to 353.64, 487.80 and 288

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Solution

The fourth proportional to 353.64, 487.80 and 288 is: 397.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.64 : 487.80 = 288 : x
  2. Step 2: Convert to fraction form
    353.64/487.80 = 288/x
  3. Step 3: Cross multiply
    353.64x = 487.80 × 288
  4. Step 4: Simplify right side
    353.64x = 140,486.40
  5. Step 5: Solve for x
    x = 140,486.40/353.64
  6. Step 6: Final answer
    x = 397.26

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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.