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Finding the Fourth Proportional to 3,119.90, 4,679.81 and 928.64

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Solution

The fourth proportional to 3,119.90, 4,679.81 and 928.64 is: 1,392.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,119.90 : 4,679.81 = 928.64 : x
  2. Step 2: Convert to fraction form
    3,119.90/4,679.81 = 928.64/x
  3. Step 3: Cross multiply
    3,119.90x = 4,679.81 × 928.64
  4. Step 4: Simplify right side
    3,119.90x = 4,345,854.12
  5. Step 5: Solve for x
    x = 4,345,854.12/3,119.90
  6. Step 6: Final answer
    x = 1,392.95

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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.