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Finding the Fourth Proportional to 2,128.70, 3,193.05 and 1,840.70

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Solution

The fourth proportional to 2,128.70, 3,193.05 and 1,840.70 is: 2,761.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.70 : 3,193.05 = 1,840.70 : x
  2. Step 2: Convert to fraction form
    2,128.70/3,193.05 = 1,840.70/x
  3. Step 3: Cross multiply
    2,128.70x = 3,193.05 × 1,840.70
  4. Step 4: Simplify right side
    2,128.70x = 5,877,447.14
  5. Step 5: Solve for x
    x = 5,877,447.14/2,128.70
  6. Step 6: Final answer
    x = 2,761.05

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Half scale
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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.