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Finding the Fourth Proportional to 648.12, 898.18 and 635.81

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Solution

The fourth proportional to 648.12, 898.18 and 635.81 is: 881.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.12 : 898.18 = 635.81 : x
  2. Step 2: Convert to fraction form
    648.12/898.18 = 635.81/x
  3. Step 3: Cross multiply
    648.12x = 898.18 × 635.81
  4. Step 4: Simplify right side
    648.12x = 571,069.58
  5. Step 5: Solve for x
    x = 571,069.58/648.12
  6. Step 6: Final answer
    x = 881.12

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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.