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Finding the Fourth Proportional to 648.73, 899.88 and 626.05

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Solution

The fourth proportional to 648.73, 899.88 and 626.05 is: 868.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.73 : 899.88 = 626.05 : x
  2. Step 2: Convert to fraction form
    648.73/899.88 = 626.05/x
  3. Step 3: Cross multiply
    648.73x = 899.88 × 626.05
  4. Step 4: Simplify right side
    648.73x = 563,369.87
  5. Step 5: Solve for x
    x = 563,369.87/648.73
  6. Step 6: Final answer
    x = 868.42

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.