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Finding the Fourth Proportional to 30,908.80, 42,651.20 and 18,331.20

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Solution

The fourth proportional to 30,908.80, 42,651.20 and 18,331.20 is: 25,295.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,908.80 : 42,651.20 = 18,331.20 : x
  2. Step 2: Convert to fraction form
    30,908.80/42,651.20 = 18,331.20/x
  3. Step 3: Cross multiply
    30,908.80x = 42,651.20 × 18,331.20
  4. Step 4: Simplify right side
    30,908.80x = 781,847,677.44
  5. Step 5: Solve for x
    x = 781,847,677.44/30,908.80
  6. Step 6: Final answer
    x = 25,295.31

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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.