Home / 1,389.90-2,085.89-1,119.26

Finding the Fourth Proportional to 1,389.90, 2,085.89 and 1,119.26

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Solution

The fourth proportional to 1,389.90, 2,085.89 and 1,119.26 is: 1,679.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.90 : 2,085.89 = 1,119.26 : x
  2. Step 2: Convert to fraction form
    1,389.90/2,085.89 = 1,119.26/x
  3. Step 3: Cross multiply
    1,389.90x = 2,085.89 × 1,119.26
  4. Step 4: Simplify right side
    1,389.90x = 2,334,652.86
  5. Step 5: Solve for x
    x = 2,334,652.86/1,389.90
  6. Step 6: Final answer
    x = 1,679.72

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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.