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Finding the Fourth Proportional to 639.06, 957.54 and 455.55

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Solution

The fourth proportional to 639.06, 957.54 and 455.55 is: 682.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.06 : 957.54 = 455.55 : x
  2. Step 2: Convert to fraction form
    639.06/957.54 = 455.55/x
  3. Step 3: Cross multiply
    639.06x = 957.54 × 455.55
  4. Step 4: Simplify right side
    639.06x = 436,207.35
  5. Step 5: Solve for x
    x = 436,207.35/639.06
  6. Step 6: Final answer
    x = 682.58

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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.