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Finding the Fourth Proportional to 1,680.64, 2,522.56 and 911.68

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Solution

The fourth proportional to 1,680.64, 2,522.56 and 911.68 is: 1,368.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.64 : 2,522.56 = 911.68 : x
  2. Step 2: Convert to fraction form
    1,680.64/2,522.56 = 911.68/x
  3. Step 3: Cross multiply
    1,680.64x = 2,522.56 × 911.68
  4. Step 4: Simplify right side
    1,680.64x = 2,299,767.50
  5. Step 5: Solve for x
    x = 2,299,767.50/1,680.64
  6. Step 6: Final answer
    x = 1,368.39

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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.