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Finding the Fourth Proportional to 3,119.84, 4,679.69 and 928.58

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Solution

The fourth proportional to 3,119.84, 4,679.69 and 928.58 is: 1,392.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,119.84 : 4,679.69 = 928.58 : x
  2. Step 2: Convert to fraction form
    3,119.84/4,679.69 = 928.58/x
  3. Step 3: Cross multiply
    3,119.84x = 4,679.69 × 928.58
  4. Step 4: Simplify right side
    3,119.84x = 4,345,480.56
  5. Step 5: Solve for x
    x = 4,345,480.56/3,119.84
  6. Step 6: Final answer
    x = 1,392.86

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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.