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Finding the Fourth Proportional to 30,421.38, 41,978.77 and 16,990.77

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Solution

The fourth proportional to 30,421.38, 41,978.77 and 16,990.77 is: 23,445.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,421.38 : 41,978.77 = 16,990.77 : x
  2. Step 2: Convert to fraction form
    30,421.38/41,978.77 = 16,990.77/x
  3. Step 3: Cross multiply
    30,421.38x = 41,978.77 × 16,990.77
  4. Step 4: Simplify right side
    30,421.38x = 713,251,583.48
  5. Step 5: Solve for x
    x = 713,251,583.48/30,421.38
  6. Step 6: Final answer
    x = 23,445.73

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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.