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Finding the Fourth Proportional to 1,011.44, 1,396.72 and 956.88

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Solution

The fourth proportional to 1,011.44, 1,396.72 and 956.88 is: 1,321.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.44 : 1,396.72 = 956.88 : x
  2. Step 2: Convert to fraction form
    1,011.44/1,396.72 = 956.88/x
  3. Step 3: Cross multiply
    1,011.44x = 1,396.72 × 956.88
  4. Step 4: Simplify right side
    1,011.44x = 1,336,493.43
  5. Step 5: Solve for x
    x = 1,336,493.43/1,011.44
  6. Step 6: Final answer
    x = 1,321.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.