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Finding the Fourth Proportional to 1,391.99, 1,920.96 and 832.86

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Solution

The fourth proportional to 1,391.99, 1,920.96 and 832.86 is: 1,149.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.99 : 1,920.96 = 832.86 : x
  2. Step 2: Convert to fraction form
    1,391.99/1,920.96 = 832.86/x
  3. Step 3: Cross multiply
    1,391.99x = 1,920.96 × 832.86
  4. Step 4: Simplify right side
    1,391.99x = 1,599,890.75
  5. Step 5: Solve for x
    x = 1,599,890.75/1,391.99
  6. Step 6: Final answer
    x = 1,149.36

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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.