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Finding the Fourth Proportional to 1,387.03, 1,912.93 and 1,091.83

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Solution

The fourth proportional to 1,387.03, 1,912.93 and 1,091.83 is: 1,505.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.03 : 1,912.93 = 1,091.83 : x
  2. Step 2: Convert to fraction form
    1,387.03/1,912.93 = 1,091.83/x
  3. Step 3: Cross multiply
    1,387.03x = 1,912.93 × 1,091.83
  4. Step 4: Simplify right side
    1,387.03x = 2,088,594.36
  5. Step 5: Solve for x
    x = 2,088,594.36/1,387.03
  6. Step 6: Final answer
    x = 1,505.80

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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.