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Finding the Fourth Proportional to 947.32, 1,421.16 and 331.20

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Solution

The fourth proportional to 947.32, 1,421.16 and 331.20 is: 496.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.32 : 1,421.16 = 331.20 : x
  2. Step 2: Convert to fraction form
    947.32/1,421.16 = 331.20/x
  3. Step 3: Cross multiply
    947.32x = 1,421.16 × 331.20
  4. Step 4: Simplify right side
    947.32x = 470,679.43
  5. Step 5: Solve for x
    x = 470,679.43/947.32
  6. Step 6: Final answer
    x = 496.86

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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.