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Finding the Fourth Proportional to 1,039.35, 1,434.01 and 640.88

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Solution

The fourth proportional to 1,039.35, 1,434.01 and 640.88 is: 884.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.35 : 1,434.01 = 640.88 : x
  2. Step 2: Convert to fraction form
    1,039.35/1,434.01 = 640.88/x
  3. Step 3: Cross multiply
    1,039.35x = 1,434.01 × 640.88
  4. Step 4: Simplify right side
    1,039.35x = 919,025.12
  5. Step 5: Solve for x
    x = 919,025.12/1,039.35
  6. Step 6: Final answer
    x = 884.23

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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.