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Finding the Fourth Proportional to 1,008.11, 1,511.98 and 641.81

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Solution

The fourth proportional to 1,008.11, 1,511.98 and 641.81 is: 962.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.11 : 1,511.98 = 641.81 : x
  2. Step 2: Convert to fraction form
    1,008.11/1,511.98 = 641.81/x
  3. Step 3: Cross multiply
    1,008.11x = 1,511.98 × 641.81
  4. Step 4: Simplify right side
    1,008.11x = 970,403.88
  5. Step 5: Solve for x
    x = 970,403.88/1,008.11
  6. Step 6: Final answer
    x = 962.60

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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.