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Finding the Fourth Proportional to 1,263.12, 1,742.70 and 996.72

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Solution

The fourth proportional to 1,263.12, 1,742.70 and 996.72 is: 1,375.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.12 : 1,742.70 = 996.72 : x
  2. Step 2: Convert to fraction form
    1,263.12/1,742.70 = 996.72/x
  3. Step 3: Cross multiply
    1,263.12x = 1,742.70 × 996.72
  4. Step 4: Simplify right side
    1,263.12x = 1,736,975.23
  5. Step 5: Solve for x
    x = 1,736,975.23/1,263.12
  6. Step 6: Final answer
    x = 1,375.15

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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.