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Finding the Fourth Proportional to 1,280.27, 1,916.82 and 662.64

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Solution

The fourth proportional to 1,280.27, 1,916.82 and 662.64 is: 992.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.27 : 1,916.82 = 662.64 : x
  2. Step 2: Convert to fraction form
    1,280.27/1,916.82 = 662.64/x
  3. Step 3: Cross multiply
    1,280.27x = 1,916.82 × 662.64
  4. Step 4: Simplify right side
    1,280.27x = 1,270,161.60
  5. Step 5: Solve for x
    x = 1,270,161.60/1,280.27
  6. Step 6: Final answer
    x = 992.10

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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.