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Finding the Fourth Proportional to 1,369.83, 1,890.44 and 810.62

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Solution

The fourth proportional to 1,369.83, 1,890.44 and 810.62 is: 1,118.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.83 : 1,890.44 = 810.62 : x
  2. Step 2: Convert to fraction form
    1,369.83/1,890.44 = 810.62/x
  3. Step 3: Cross multiply
    1,369.83x = 1,890.44 × 810.62
  4. Step 4: Simplify right side
    1,369.83x = 1,532,435.73
  5. Step 5: Solve for x
    x = 1,532,435.73/1,369.83
  6. Step 6: Final answer
    x = 1,118.71

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1.5x scale

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.