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Finding the Fourth Proportional to 21,978.95, 30,330.96 and 11,907.35

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Solution

The fourth proportional to 21,978.95, 30,330.96 and 11,907.35 is: 16,432.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978.95 : 30,330.96 = 11,907.35 : x
  2. Step 2: Convert to fraction form
    21,978.95/30,330.96 = 11,907.35/x
  3. Step 3: Cross multiply
    21,978.95x = 30,330.96 × 11,907.35
  4. Step 4: Simplify right side
    21,978.95x = 361,161,444.60
  5. Step 5: Solve for x
    x = 361,161,444.60/21,978.95
  6. Step 6: Final answer
    x = 16,432.16

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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.