Home / 2,129.10-2,938.21-1,289.95

Finding the Fourth Proportional to 2,129.10, 2,938.21 and 1,289.95

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Solution

The fourth proportional to 2,129.10, 2,938.21 and 1,289.95 is: 1,780.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.10 : 2,938.21 = 1,289.95 : x
  2. Step 2: Convert to fraction form
    2,129.10/2,938.21 = 1,289.95/x
  3. Step 3: Cross multiply
    2,129.10x = 2,938.21 × 1,289.95
  4. Step 4: Simplify right side
    2,129.10x = 3,790,143.99
  5. Step 5: Solve for x
    x = 3,790,143.99/2,129.10
  6. Step 6: Final answer
    x = 1,780.16

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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.