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Finding the Fourth Proportional to 947.42, 1,418.05 and 816.20

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Solution

The fourth proportional to 947.42, 1,418.05 and 816.20 is: 1,221.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.42 : 1,418.05 = 816.20 : x
  2. Step 2: Convert to fraction form
    947.42/1,418.05 = 816.20/x
  3. Step 3: Cross multiply
    947.42x = 1,418.05 × 816.20
  4. Step 4: Simplify right side
    947.42x = 1,157,416.98
  5. Step 5: Solve for x
    x = 1,157,416.98/947.42
  6. Step 6: Final answer
    x = 1,221.65

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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.