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Finding the Fourth Proportional to 813.00, 1,121.93 and 439.97

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Solution

The fourth proportional to 813.00, 1,121.93 and 439.97 is: 607.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.00 : 1,121.93 = 439.97 : x
  2. Step 2: Convert to fraction form
    813.00/1,121.93 = 439.97/x
  3. Step 3: Cross multiply
    813.00x = 1,121.93 × 439.97
  4. Step 4: Simplify right side
    813.00x = 493,611.64
  5. Step 5: Solve for x
    x = 493,611.64/813.00
  6. Step 6: Final answer
    x = 607.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.