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Finding the Fourth Proportional to 1,389.71, 2,083.68 and 696.19

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Solution

The fourth proportional to 1,389.71, 2,083.68 and 696.19 is: 1,043.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.71 : 2,083.68 = 696.19 : x
  2. Step 2: Convert to fraction form
    1,389.71/2,083.68 = 696.19/x
  3. Step 3: Cross multiply
    1,389.71x = 2,083.68 × 696.19
  4. Step 4: Simplify right side
    1,389.71x = 1,450,625.02
  5. Step 5: Solve for x
    x = 1,450,625.02/1,389.71
  6. Step 6: Final answer
    x = 1,043.84

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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.