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Finding the Fourth Proportional to 1,993.81, 2,990.72 and 1,263.60

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Solution

The fourth proportional to 1,993.81, 2,990.72 and 1,263.60 is: 1,895.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.81 : 2,990.72 = 1,263.60 : x
  2. Step 2: Convert to fraction form
    1,993.81/2,990.72 = 1,263.60/x
  3. Step 3: Cross multiply
    1,993.81x = 2,990.72 × 1,263.60
  4. Step 4: Simplify right side
    1,993.81x = 3,779,073.79
  5. Step 5: Solve for x
    x = 3,779,073.79/1,993.81
  6. Step 6: Final answer
    x = 1,895.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.