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Finding the Fourth Proportional to 21,978.85, 30,330.77 and 11,907.54

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Solution

The fourth proportional to 21,978.85, 30,330.77 and 11,907.54 is: 16,432.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978.85 : 30,330.77 = 11,907.54 : x
  2. Step 2: Convert to fraction form
    21,978.85/30,330.77 = 11,907.54/x
  3. Step 3: Cross multiply
    21,978.85x = 30,330.77 × 11,907.54
  4. Step 4: Simplify right side
    21,978.85x = 361,165,000.52
  5. Step 5: Solve for x
    x = 361,165,000.52/21,978.85
  6. Step 6: Final answer
    x = 16,432.39

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1.5x scale

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.