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Finding the Fourth Proportional to 3,890.70, 5,369.13 and 2,398.02

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Solution

The fourth proportional to 3,890.70, 5,369.13 and 2,398.02 is: 3,309.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.70 : 5,369.13 = 2,398.02 : x
  2. Step 2: Convert to fraction form
    3,890.70/5,369.13 = 2,398.02/x
  3. Step 3: Cross multiply
    3,890.70x = 5,369.13 × 2,398.02
  4. Step 4: Simplify right side
    3,890.70x = 12,875,281.12
  5. Step 5: Solve for x
    x = 12,875,281.12/3,890.70
  6. Step 6: Final answer
    x = 3,309.25

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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.