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Finding the Fourth Proportional to 353.48, 487.55 and 291.21

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Solution

The fourth proportional to 353.48, 487.55 and 291.21 is: 401.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.48 : 487.55 = 291.21 : x
  2. Step 2: Convert to fraction form
    353.48/487.55 = 291.21/x
  3. Step 3: Cross multiply
    353.48x = 487.55 × 291.21
  4. Step 4: Simplify right side
    353.48x = 141,978.34
  5. Step 5: Solve for x
    x = 141,978.34/353.48
  6. Step 6: Final answer
    x = 401.66

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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.