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Finding the Fourth Proportional to 2,114.63, 3,172.09 and 653.59

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Solution

The fourth proportional to 2,114.63, 3,172.09 and 653.59 is: 980.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,114.63 : 3,172.09 = 653.59 : x
  2. Step 2: Convert to fraction form
    2,114.63/3,172.09 = 653.59/x
  3. Step 3: Cross multiply
    2,114.63x = 3,172.09 × 653.59
  4. Step 4: Simplify right side
    2,114.63x = 2,073,236.74
  5. Step 5: Solve for x
    x = 2,073,236.74/2,114.63
  6. Step 6: Final answer
    x = 980.43

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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.