Home / 30,965.22-42,749.73-20,385.62

Finding the Fourth Proportional to 30,965.22, 42,749.73 and 20,385.62

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Solution

The fourth proportional to 30,965.22, 42,749.73 and 20,385.62 is: 28,143.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,965.22 : 42,749.73 = 20,385.62 : x
  2. Step 2: Convert to fraction form
    30,965.22/42,749.73 = 20,385.62/x
  3. Step 3: Cross multiply
    30,965.22x = 42,749.73 × 20,385.62
  4. Step 4: Simplify right side
    30,965.22x = 871,479,537.13
  5. Step 5: Solve for x
    x = 871,479,537.13/30,965.22
  6. Step 6: Final answer
    x = 28,143.82

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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.