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Finding the Fourth Proportional to 3,390.79, 4,679.15 and 1,974.52

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Solution

The fourth proportional to 3,390.79, 4,679.15 and 1,974.52 is: 2,724.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.79 : 4,679.15 = 1,974.52 : x
  2. Step 2: Convert to fraction form
    3,390.79/4,679.15 = 1,974.52/x
  3. Step 3: Cross multiply
    3,390.79x = 4,679.15 × 1,974.52
  4. Step 4: Simplify right side
    3,390.79x = 9,239,051.86
  5. Step 5: Solve for x
    x = 9,239,051.86/3,390.79
  6. Step 6: Final answer
    x = 2,724.75

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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.