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Finding the Fourth Proportional to 3,119.81, 4,680 and 928.14

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Solution

The fourth proportional to 3,119.81, 4,680 and 928.14 is: 1,392.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,119.81 : 4,680 = 928.14 : x
  2. Step 2: Convert to fraction form
    3,119.81/4,680 = 928.14/x
  3. Step 3: Cross multiply
    3,119.81x = 4,680 × 928.14
  4. Step 4: Simplify right side
    3,119.81x = 4,343,695.20
  5. Step 5: Solve for x
    x = 4,343,695.20/3,119.81
  6. Step 6: Final answer
    x = 1,392.30

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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.