Home / 1,553.18-2,143.40-890.12

Finding the Fourth Proportional to 1,553.18, 2,143.40 and 890.12

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Solution

The fourth proportional to 1,553.18, 2,143.40 and 890.12 is: 1,228.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.18 : 2,143.40 = 890.12 : x
  2. Step 2: Convert to fraction form
    1,553.18/2,143.40 = 890.12/x
  3. Step 3: Cross multiply
    1,553.18x = 2,143.40 × 890.12
  4. Step 4: Simplify right side
    1,553.18x = 1,907,884.12
  5. Step 5: Solve for x
    x = 1,907,884.12/1,553.18
  6. Step 6: Final answer
    x = 1,228.38

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Half scale
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Double scale
Find fourth proportional to 1,554.18, 2,144.78 and 891.12
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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.