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Finding the Fourth Proportional to 1,330.90, 1,993.95 and 1,086.10

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Solution

The fourth proportional to 1,330.90, 1,993.95 and 1,086.10 is: 1,627.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.90 : 1,993.95 = 1,086.10 : x
  2. Step 2: Convert to fraction form
    1,330.90/1,993.95 = 1,086.10/x
  3. Step 3: Cross multiply
    1,330.90x = 1,993.95 × 1,086.10
  4. Step 4: Simplify right side
    1,330.90x = 2,165,629.10
  5. Step 5: Solve for x
    x = 2,165,629.10/1,330.90
  6. Step 6: Final answer
    x = 1,627.19

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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.