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Finding the Fourth Proportional to 1,218.42, 1,680.84 and 902.97

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Solution

The fourth proportional to 1,218.42, 1,680.84 and 902.97 is: 1,245.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.42 : 1,680.84 = 902.97 : x
  2. Step 2: Convert to fraction form
    1,218.42/1,680.84 = 902.97/x
  3. Step 3: Cross multiply
    1,218.42x = 1,680.84 × 902.97
  4. Step 4: Simplify right side
    1,218.42x = 1,517,748.09
  5. Step 5: Solve for x
    x = 1,517,748.09/1,218.42
  6. Step 6: Final answer
    x = 1,245.67

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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.