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Finding the Fourth Proportional to 1,382.12, 2,069.78 and 893.68

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Solution

The fourth proportional to 1,382.12, 2,069.78 and 893.68 is: 1,338.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.12 : 2,069.78 = 893.68 : x
  2. Step 2: Convert to fraction form
    1,382.12/2,069.78 = 893.68/x
  3. Step 3: Cross multiply
    1,382.12x = 2,069.78 × 893.68
  4. Step 4: Simplify right side
    1,382.12x = 1,849,720.99
  5. Step 5: Solve for x
    x = 1,849,720.99/1,382.12
  6. Step 6: Final answer
    x = 1,338.32

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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.