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Finding the Fourth Proportional to 353.32, 487.14 and 291.40

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Solution

The fourth proportional to 353.32, 487.14 and 291.40 is: 401.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.32 : 487.14 = 291.40 : x
  2. Step 2: Convert to fraction form
    353.32/487.14 = 291.40/x
  3. Step 3: Cross multiply
    353.32x = 487.14 × 291.40
  4. Step 4: Simplify right side
    353.32x = 141,952.60
  5. Step 5: Solve for x
    x = 141,952.60/353.32
  6. Step 6: Final answer
    x = 401.77

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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.