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Finding the Fourth Proportional to 947.72, 1,422.38 and 400.30

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Solution

The fourth proportional to 947.72, 1,422.38 and 400.30 is: 600.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.72 : 1,422.38 = 400.30 : x
  2. Step 2: Convert to fraction form
    947.72/1,422.38 = 400.30/x
  3. Step 3: Cross multiply
    947.72x = 1,422.38 × 400.30
  4. Step 4: Simplify right side
    947.72x = 569,376.16
  5. Step 5: Solve for x
    x = 569,376.16/947.72
  6. Step 6: Final answer
    x = 600.78

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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.