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Finding the Fourth Proportional to 3,419.76, 4,719.72 and 1,928

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Solution

The fourth proportional to 3,419.76, 4,719.72 and 1,928 is: 2,660.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,419.76 : 4,719.72 = 1,928 : x
  2. Step 2: Convert to fraction form
    3,419.76/4,719.72 = 1,928/x
  3. Step 3: Cross multiply
    3,419.76x = 4,719.72 × 1,928
  4. Step 4: Simplify right side
    3,419.76x = 9,099,620.16
  5. Step 5: Solve for x
    x = 9,099,620.16/3,419.76
  6. Step 6: Final answer
    x = 2,660.89

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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.