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Finding the Fourth Proportional to 1,380.05, 2,070.58 and 640.01

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Solution

The fourth proportional to 1,380.05, 2,070.58 and 640.01 is: 960.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.05 : 2,070.58 = 640.01 : x
  2. Step 2: Convert to fraction form
    1,380.05/2,070.58 = 640.01/x
  3. Step 3: Cross multiply
    1,380.05x = 2,070.58 × 640.01
  4. Step 4: Simplify right side
    1,380.05x = 1,325,195.48
  5. Step 5: Solve for x
    x = 1,325,195.48/1,380.05
  6. Step 6: Final answer
    x = 960.26

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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.