Home / 1,553.43-2,143.77-890.31

Finding the Fourth Proportional to 1,553.43, 2,143.77 and 890.31

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Solution

The fourth proportional to 1,553.43, 2,143.77 and 890.31 is: 1,228.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.43 : 2,143.77 = 890.31 : x
  2. Step 2: Convert to fraction form
    1,553.43/2,143.77 = 890.31/x
  3. Step 3: Cross multiply
    1,553.43x = 2,143.77 × 890.31
  4. Step 4: Simplify right side
    1,553.43x = 1,908,619.87
  5. Step 5: Solve for x
    x = 1,908,619.87/1,553.43
  6. Step 6: Final answer
    x = 1,228.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.