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Finding the Fourth Proportional to 1,380.78, 2,070.81 and 649.62

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Solution

The fourth proportional to 1,380.78, 2,070.81 and 649.62 is: 974.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.78 : 2,070.81 = 649.62 : x
  2. Step 2: Convert to fraction form
    1,380.78/2,070.81 = 649.62/x
  3. Step 3: Cross multiply
    1,380.78x = 2,070.81 × 649.62
  4. Step 4: Simplify right side
    1,380.78x = 1,345,239.59
  5. Step 5: Solve for x
    x = 1,345,239.59/1,380.78
  6. Step 6: Final answer
    x = 974.26

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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.