Home / 1,909.40-2,629.12-1,438

Finding the Fourth Proportional to 1,909.40, 2,629.12 and 1,438

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Solution

The fourth proportional to 1,909.40, 2,629.12 and 1,438 is: 1,980.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.40 : 2,629.12 = 1,438 : x
  2. Step 2: Convert to fraction form
    1,909.40/2,629.12 = 1,438/x
  3. Step 3: Cross multiply
    1,909.40x = 2,629.12 × 1,438
  4. Step 4: Simplify right side
    1,909.40x = 3,780,674.56
  5. Step 5: Solve for x
    x = 3,780,674.56/1,909.40
  6. Step 6: Final answer
    x = 1,980.03

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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.