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Finding the Fourth Proportional to 1,220.72, 1,680.96 and 1,086

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Solution

The fourth proportional to 1,220.72, 1,680.96 and 1,086 is: 1,495.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.72 : 1,680.96 = 1,086 : x
  2. Step 2: Convert to fraction form
    1,220.72/1,680.96 = 1,086/x
  3. Step 3: Cross multiply
    1,220.72x = 1,680.96 × 1,086
  4. Step 4: Simplify right side
    1,220.72x = 1,825,522.56
  5. Step 5: Solve for x
    x = 1,825,522.56/1,220.72
  6. Step 6: Final answer
    x = 1,495.45

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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.