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Finding the Fourth Proportional to 2,129, 2,938.20 and 1,197.68

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Solution

The fourth proportional to 2,129, 2,938.20 and 1,197.68 is: 1,652.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129 : 2,938.20 = 1,197.68 : x
  2. Step 2: Convert to fraction form
    2,129/2,938.20 = 1,197.68/x
  3. Step 3: Cross multiply
    2,129x = 2,938.20 × 1,197.68
  4. Step 4: Simplify right side
    2,129x = 3,519,023.38
  5. Step 5: Solve for x
    x = 3,519,023.38/2,129
  6. Step 6: Final answer
    x = 1,652.90

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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.