Home / 1,553.31-2,143.62-890.19

Finding the Fourth Proportional to 1,553.31, 2,143.62 and 890.19

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Solution

The fourth proportional to 1,553.31, 2,143.62 and 890.19 is: 1,228.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.31 : 2,143.62 = 890.19 : x
  2. Step 2: Convert to fraction form
    1,553.31/2,143.62 = 890.19/x
  3. Step 3: Cross multiply
    1,553.31x = 2,143.62 × 890.19
  4. Step 4: Simplify right side
    1,553.31x = 1,908,229.09
  5. Step 5: Solve for x
    x = 1,908,229.09/1,553.31
  6. Step 6: Final answer
    x = 1,228.49

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Half scale
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Double scale
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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.