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Finding the Fourth Proportional to 640.83, 959.36 and 435.05

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Solution

The fourth proportional to 640.83, 959.36 and 435.05 is: 651.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.83 : 959.36 = 435.05 : x
  2. Step 2: Convert to fraction form
    640.83/959.36 = 435.05/x
  3. Step 3: Cross multiply
    640.83x = 959.36 × 435.05
  4. Step 4: Simplify right side
    640.83x = 417,362.60
  5. Step 5: Solve for x
    x = 417,362.60/640.83
  6. Step 6: Final answer
    x = 651.28

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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.