Home / 1,396.08-2,089.80-745.20

Finding the Fourth Proportional to 1,396.08, 2,089.80 and 745.20

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Solution

The fourth proportional to 1,396.08, 2,089.80 and 745.20 is: 1,115.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.08 : 2,089.80 = 745.20 : x
  2. Step 2: Convert to fraction form
    1,396.08/2,089.80 = 745.20/x
  3. Step 3: Cross multiply
    1,396.08x = 2,089.80 × 745.20
  4. Step 4: Simplify right side
    1,396.08x = 1,557,318.96
  5. Step 5: Solve for x
    x = 1,557,318.96/1,396.08
  6. Step 6: Final answer
    x = 1,115.49

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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.