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Finding the Fourth Proportional to 11,890.40, 17,830.20 and 5,313.20

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Solution

The fourth proportional to 11,890.40, 17,830.20 and 5,313.20 is: 7,967.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,890.40 : 17,830.20 = 5,313.20 : x
  2. Step 2: Convert to fraction form
    11,890.40/17,830.20 = 5,313.20/x
  3. Step 3: Cross multiply
    11,890.40x = 17,830.20 × 5,313.20
  4. Step 4: Simplify right side
    11,890.40x = 94,735,418.64
  5. Step 5: Solve for x
    x = 94,735,418.64/11,890.40
  6. Step 6: Final answer
    x = 7,967.39

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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.