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Finding the Fourth Proportional to 1,998.86, 2,758.47 and 1,114.75

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Solution

The fourth proportional to 1,998.86, 2,758.47 and 1,114.75 is: 1,538.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.86 : 2,758.47 = 1,114.75 : x
  2. Step 2: Convert to fraction form
    1,998.86/2,758.47 = 1,114.75/x
  3. Step 3: Cross multiply
    1,998.86x = 2,758.47 × 1,114.75
  4. Step 4: Simplify right side
    1,998.86x = 3,075,004.43
  5. Step 5: Solve for x
    x = 3,075,004.43/1,998.86
  6. Step 6: Final answer
    x = 1,538.38

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Double scale
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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.