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Finding the Fourth Proportional to 1,553.88, 2,144.40 and 890.76

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Solution

The fourth proportional to 1,553.88, 2,144.40 and 890.76 is: 1,229.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.88 : 2,144.40 = 890.76 : x
  2. Step 2: Convert to fraction form
    1,553.88/2,144.40 = 890.76/x
  3. Step 3: Cross multiply
    1,553.88x = 2,144.40 × 890.76
  4. Step 4: Simplify right side
    1,553.88x = 1,910,145.74
  5. Step 5: Solve for x
    x = 1,910,145.74/1,553.88
  6. Step 6: Final answer
    x = 1,229.27

Related Problems

Find fourth proportional to 776.94, 1,072.20 and 445.38
Half scale
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Double scale
Find fourth proportional to 1,554.88, 2,145.78 and 891.76
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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.