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Finding the Fourth Proportional to 353.80, 487.86 and 291.55

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Solution

The fourth proportional to 353.80, 487.86 and 291.55 is: 402.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.80 : 487.86 = 291.55 : x
  2. Step 2: Convert to fraction form
    353.80/487.86 = 291.55/x
  3. Step 3: Cross multiply
    353.80x = 487.86 × 291.55
  4. Step 4: Simplify right side
    353.80x = 142,235.58
  5. Step 5: Solve for x
    x = 142,235.58/353.80
  6. Step 6: Final answer
    x = 402.02

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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.