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Finding the Fourth Proportional to 724.21, 1,086.30 and 291.35

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Solution

The fourth proportional to 724.21, 1,086.30 and 291.35 is: 437.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.21 : 1,086.30 = 291.35 : x
  2. Step 2: Convert to fraction form
    724.21/1,086.30 = 291.35/x
  3. Step 3: Cross multiply
    724.21x = 1,086.30 × 291.35
  4. Step 4: Simplify right side
    724.21x = 316,496.22
  5. Step 5: Solve for x
    x = 316,496.22/724.21
  6. Step 6: Final answer
    x = 437.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.