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Finding the Fourth Proportional to 30,419.41, 41,978.33 and 16,990.85

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Solution

The fourth proportional to 30,419.41, 41,978.33 and 16,990.85 is: 23,447.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,419.41 : 41,978.33 = 16,990.85 : x
  2. Step 2: Convert to fraction form
    30,419.41/41,978.33 = 16,990.85/x
  3. Step 3: Cross multiply
    30,419.41x = 41,978.33 × 16,990.85
  4. Step 4: Simplify right side
    30,419.41x = 713,247,508.28
  5. Step 5: Solve for x
    x = 713,247,508.28/30,419.41
  6. Step 6: Final answer
    x = 23,447.12

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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.