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Finding the Fourth Proportional to 1,938.40, 2,906.70 and 842.20

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Solution

The fourth proportional to 1,938.40, 2,906.70 and 842.20 is: 1,262.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.40 : 2,906.70 = 842.20 : x
  2. Step 2: Convert to fraction form
    1,938.40/2,906.70 = 842.20/x
  3. Step 3: Cross multiply
    1,938.40x = 2,906.70 × 842.20
  4. Step 4: Simplify right side
    1,938.40x = 2,448,022.74
  5. Step 5: Solve for x
    x = 2,448,022.74/1,938.40
  6. Step 6: Final answer
    x = 1,262.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.