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Finding the Fourth Proportional to 2,851.40, 3,934.88 and 1,609.40

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Solution

The fourth proportional to 2,851.40, 3,934.88 and 1,609.40 is: 2,220.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,851.40 : 3,934.88 = 1,609.40 : x
  2. Step 2: Convert to fraction form
    2,851.40/3,934.88 = 1,609.40/x
  3. Step 3: Cross multiply
    2,851.40x = 3,934.88 × 1,609.40
  4. Step 4: Simplify right side
    2,851.40x = 6,332,795.87
  5. Step 5: Solve for x
    x = 6,332,795.87/2,851.40
  6. Step 6: Final answer
    x = 2,220.94

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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.