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Finding the Fourth Proportional to 2,129.85, 2,940.62 and 1,905.08

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Solution

The fourth proportional to 2,129.85, 2,940.62 and 1,905.08 is: 2,630.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.85 : 2,940.62 = 1,905.08 : x
  2. Step 2: Convert to fraction form
    2,129.85/2,940.62 = 1,905.08/x
  3. Step 3: Cross multiply
    2,129.85x = 2,940.62 × 1,905.08
  4. Step 4: Simplify right side
    2,129.85x = 5,602,116.35
  5. Step 5: Solve for x
    x = 5,602,116.35/2,129.85
  6. Step 6: Final answer
    x = 2,630.29

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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.