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Finding the Fourth Proportional to 947.68, 1,421.58 and 331.31

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Solution

The fourth proportional to 947.68, 1,421.58 and 331.31 is: 496.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.68 : 1,421.58 = 331.31 : x
  2. Step 2: Convert to fraction form
    947.68/1,421.58 = 331.31/x
  3. Step 3: Cross multiply
    947.68x = 1,421.58 × 331.31
  4. Step 4: Simplify right side
    947.68x = 470,983.67
  5. Step 5: Solve for x
    x = 470,983.67/947.68
  6. Step 6: Final answer
    x = 496.99

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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.