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Finding the Fourth Proportional to 3,119.86, 4,679.97 and 928.40

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Solution

The fourth proportional to 3,119.86, 4,679.97 and 928.40 is: 1,392.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,119.86 : 4,679.97 = 928.40 : x
  2. Step 2: Convert to fraction form
    3,119.86/4,679.97 = 928.40/x
  3. Step 3: Cross multiply
    3,119.86x = 4,679.97 × 928.40
  4. Step 4: Simplify right side
    3,119.86x = 4,344,884.15
  5. Step 5: Solve for x
    x = 4,344,884.15/3,119.86
  6. Step 6: Final answer
    x = 1,392.66

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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.