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Finding the Fourth Proportional to 1,938.88, 2,908.56 and 641.20

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Solution

The fourth proportional to 1,938.88, 2,908.56 and 641.20 is: 961.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.88 : 2,908.56 = 641.20 : x
  2. Step 2: Convert to fraction form
    1,938.88/2,908.56 = 641.20/x
  3. Step 3: Cross multiply
    1,938.88x = 2,908.56 × 641.20
  4. Step 4: Simplify right side
    1,938.88x = 1,864,968.67
  5. Step 5: Solve for x
    x = 1,864,968.67/1,938.88
  6. Step 6: Final answer
    x = 961.88

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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.