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Finding the Fourth Proportional to 1,389.70, 2,083.98 and 696.10

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Solution

The fourth proportional to 1,389.70, 2,083.98 and 696.10 is: 1,043.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.70 : 2,083.98 = 696.10 : x
  2. Step 2: Convert to fraction form
    1,389.70/2,083.98 = 696.10/x
  3. Step 3: Cross multiply
    1,389.70x = 2,083.98 × 696.10
  4. Step 4: Simplify right side
    1,389.70x = 1,450,658.48
  5. Step 5: Solve for x
    x = 1,450,658.48/1,389.70
  6. Step 6: Final answer
    x = 1,043.86

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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.