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Finding the Fourth Proportional to 1,678.50, 2,517.34 and 638.62

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Solution

The fourth proportional to 1,678.50, 2,517.34 and 638.62 is: 957.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.50 : 2,517.34 = 638.62 : x
  2. Step 2: Convert to fraction form
    1,678.50/2,517.34 = 638.62/x
  3. Step 3: Cross multiply
    1,678.50x = 2,517.34 × 638.62
  4. Step 4: Simplify right side
    1,678.50x = 1,607,623.67
  5. Step 5: Solve for x
    x = 1,607,623.67/1,678.50
  6. Step 6: Final answer
    x = 957.77

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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.