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Finding the Fourth Proportional to 947.30, 1,421.08 and 331.19

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Solution

The fourth proportional to 947.30, 1,421.08 and 331.19 is: 496.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.30 : 1,421.08 = 331.19 : x
  2. Step 2: Convert to fraction form
    947.30/1,421.08 = 331.19/x
  3. Step 3: Cross multiply
    947.30x = 1,421.08 × 331.19
  4. Step 4: Simplify right side
    947.30x = 470,639.55
  5. Step 5: Solve for x
    x = 470,639.55/947.30
  6. Step 6: Final answer
    x = 496.82

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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.