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Finding the Fourth Proportional to 30,999.90, 42,786.03 and 18,422.22

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Solution

The fourth proportional to 30,999.90, 42,786.03 and 18,422.22 is: 25,426.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,999.90 : 42,786.03 = 18,422.22 : x
  2. Step 2: Convert to fraction form
    30,999.90/42,786.03 = 18,422.22/x
  3. Step 3: Cross multiply
    30,999.90x = 42,786.03 × 18,422.22
  4. Step 4: Simplify right side
    30,999.90x = 788,213,657.59
  5. Step 5: Solve for x
    x = 788,213,657.59/30,999.90
  6. Step 6: Final answer
    x = 25,426.33

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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.