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Finding the Fourth Proportional to 2,123.55, 3,185.33 and 890.55

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Solution

The fourth proportional to 2,123.55, 3,185.33 and 890.55 is: 1,335.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,123.55 : 3,185.33 = 890.55 : x
  2. Step 2: Convert to fraction form
    2,123.55/3,185.33 = 890.55/x
  3. Step 3: Cross multiply
    2,123.55x = 3,185.33 × 890.55
  4. Step 4: Simplify right side
    2,123.55x = 2,836,691.18
  5. Step 5: Solve for x
    x = 2,836,691.18/2,123.55
  6. Step 6: Final answer
    x = 1,335.83

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Double scale
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Similar ratio
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1.5x scale

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.