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Finding the Fourth Proportional to 953.28, 1,431.36 and 912.24

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Solution

The fourth proportional to 953.28, 1,431.36 and 912.24 is: 1,369.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.28 : 1,431.36 = 912.24 : x
  2. Step 2: Convert to fraction form
    953.28/1,431.36 = 912.24/x
  3. Step 3: Cross multiply
    953.28x = 1,431.36 × 912.24
  4. Step 4: Simplify right side
    953.28x = 1,305,743.85
  5. Step 5: Solve for x
    x = 1,305,743.85/953.28
  6. Step 6: Final answer
    x = 1,369.74

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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.