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Finding the Fourth Proportional to 2,129.67, 2,938.21 and 1,245.42

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Solution

The fourth proportional to 2,129.67, 2,938.21 and 1,245.42 is: 1,718.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.67 : 2,938.21 = 1,245.42 : x
  2. Step 2: Convert to fraction form
    2,129.67/2,938.21 = 1,245.42/x
  3. Step 3: Cross multiply
    2,129.67x = 2,938.21 × 1,245.42
  4. Step 4: Simplify right side
    2,129.67x = 3,659,302.38
  5. Step 5: Solve for x
    x = 3,659,302.38/2,129.67
  6. Step 6: Final answer
    x = 1,718.25

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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.