Home / 1,991.12-2,747.62-1,106.90

Finding the Fourth Proportional to 1,991.12, 2,747.62 and 1,106.90

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Solution

The fourth proportional to 1,991.12, 2,747.62 and 1,106.90 is: 1,527.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.12 : 2,747.62 = 1,106.90 : x
  2. Step 2: Convert to fraction form
    1,991.12/2,747.62 = 1,106.90/x
  3. Step 3: Cross multiply
    1,991.12x = 2,747.62 × 1,106.90
  4. Step 4: Simplify right side
    1,991.12x = 3,041,337.81
  5. Step 5: Solve for x
    x = 3,041,337.81/1,991.12
  6. Step 6: Final answer
    x = 1,527.45

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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.