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Finding the Fourth Proportional to 1,374.29, 1,895.80 and 813.80

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Solution

The fourth proportional to 1,374.29, 1,895.80 and 813.80 is: 1,122.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.29 : 1,895.80 = 813.80 : x
  2. Step 2: Convert to fraction form
    1,374.29/1,895.80 = 813.80/x
  3. Step 3: Cross multiply
    1,374.29x = 1,895.80 × 813.80
  4. Step 4: Simplify right side
    1,374.29x = 1,542,802.04
  5. Step 5: Solve for x
    x = 1,542,802.04/1,374.29
  6. Step 6: Final answer
    x = 1,122.62

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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.