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Finding the Fourth Proportional to 30,759.80, 42,453.04 and 18,821.20

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Solution

The fourth proportional to 30,759.80, 42,453.04 and 18,821.20 is: 25,976.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,759.80 : 42,453.04 = 18,821.20 : x
  2. Step 2: Convert to fraction form
    30,759.80/42,453.04 = 18,821.20/x
  3. Step 3: Cross multiply
    30,759.80x = 42,453.04 × 18,821.20
  4. Step 4: Simplify right side
    30,759.80x = 799,017,156.45
  5. Step 5: Solve for x
    x = 799,017,156.45/30,759.80
  6. Step 6: Final answer
    x = 25,976.02

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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.