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Finding the Fourth Proportional to 1,442.53, 1,990.66 and 813.05

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Solution

The fourth proportional to 1,442.53, 1,990.66 and 813.05 is: 1,121.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.53 : 1,990.66 = 813.05 : x
  2. Step 2: Convert to fraction form
    1,442.53/1,990.66 = 813.05/x
  3. Step 3: Cross multiply
    1,442.53x = 1,990.66 × 813.05
  4. Step 4: Simplify right side
    1,442.53x = 1,618,492.09
  5. Step 5: Solve for x
    x = 1,618,492.09/1,442.53
  6. Step 6: Final answer
    x = 1,121.99

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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.