Home / 1,619.90-2,429.85-1,390.26

Finding the Fourth Proportional to 1,619.90, 2,429.85 and 1,390.26

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Solution

The fourth proportional to 1,619.90, 2,429.85 and 1,390.26 is: 2,085.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.90 : 2,429.85 = 1,390.26 : x
  2. Step 2: Convert to fraction form
    1,619.90/2,429.85 = 1,390.26/x
  3. Step 3: Cross multiply
    1,619.90x = 2,429.85 × 1,390.26
  4. Step 4: Simplify right side
    1,619.90x = 3,378,129.77
  5. Step 5: Solve for x
    x = 3,378,129.77/1,619.90
  6. Step 6: Final answer
    x = 2,085.40

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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.