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Finding the Fourth Proportional to 1,434.03, 1,978.90 and 813.03

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Solution

The fourth proportional to 1,434.03, 1,978.90 and 813.03 is: 1,121.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,434.03 : 1,978.90 = 813.03 : x
  2. Step 2: Convert to fraction form
    1,434.03/1,978.90 = 813.03/x
  3. Step 3: Cross multiply
    1,434.03x = 1,978.90 × 813.03
  4. Step 4: Simplify right side
    1,434.03x = 1,608,905.07
  5. Step 5: Solve for x
    x = 1,608,905.07/1,434.03
  6. Step 6: Final answer
    x = 1,121.95

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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.