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Finding the Fourth Proportional to 30,950, 42,690.48 and 20,741.32

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Solution

The fourth proportional to 30,950, 42,690.48 and 20,741.32 is: 28,609.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,950 : 42,690.48 = 20,741.32 : x
  2. Step 2: Convert to fraction form
    30,950/42,690.48 = 20,741.32/x
  3. Step 3: Cross multiply
    30,950x = 42,690.48 × 20,741.32
  4. Step 4: Simplify right side
    30,950x = 885,456,906.63
  5. Step 5: Solve for x
    x = 885,456,906.63/30,950
  6. Step 6: Final answer
    x = 28,609.27

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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.