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Finding the Fourth Proportional to 1,400.86, 1,933.36 and 811.40

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Solution

The fourth proportional to 1,400.86, 1,933.36 and 811.40 is: 1,119.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.86 : 1,933.36 = 811.40 : x
  2. Step 2: Convert to fraction form
    1,400.86/1,933.36 = 811.40/x
  3. Step 3: Cross multiply
    1,400.86x = 1,933.36 × 811.40
  4. Step 4: Simplify right side
    1,400.86x = 1,568,728.30
  5. Step 5: Solve for x
    x = 1,568,728.30/1,400.86
  6. Step 6: Final answer
    x = 1,119.83

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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.