Home / 1,938.40-2,674.12-1,308.74

Finding the Fourth Proportional to 1,938.40, 2,674.12 and 1,308.74

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Solution

The fourth proportional to 1,938.40, 2,674.12 and 1,308.74 is: 1,805.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.40 : 2,674.12 = 1,308.74 : x
  2. Step 2: Convert to fraction form
    1,938.40/2,674.12 = 1,308.74/x
  3. Step 3: Cross multiply
    1,938.40x = 2,674.12 × 1,308.74
  4. Step 4: Simplify right side
    1,938.40x = 3,499,727.81
  5. Step 5: Solve for x
    x = 3,499,727.81/1,938.40
  6. Step 6: Final answer
    x = 1,805.47

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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.