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Finding the Fourth Proportional to 1,324.11, 1,985.45 and 811.47

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Solution

The fourth proportional to 1,324.11, 1,985.45 and 811.47 is: 1,216.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.11 : 1,985.45 = 811.47 : x
  2. Step 2: Convert to fraction form
    1,324.11/1,985.45 = 811.47/x
  3. Step 3: Cross multiply
    1,324.11x = 1,985.45 × 811.47
  4. Step 4: Simplify right side
    1,324.11x = 1,611,129.05
  5. Step 5: Solve for x
    x = 1,611,129.05/1,324.11
  6. Step 6: Final answer
    x = 1,216.76

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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.