Home / 30,735.72-42,387.30-20,121.48

Finding the Fourth Proportional to 30,735.72, 42,387.30 and 20,121.48

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Solution

The fourth proportional to 30,735.72, 42,387.30 and 20,121.48 is: 27,749.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,735.72 : 42,387.30 = 20,121.48 : x
  2. Step 2: Convert to fraction form
    30,735.72/42,387.30 = 20,121.48/x
  3. Step 3: Cross multiply
    30,735.72x = 42,387.30 × 20,121.48
  4. Step 4: Simplify right side
    30,735.72x = 852,895,209.20
  5. Step 5: Solve for x
    x = 852,895,209.20/30,735.72
  6. Step 6: Final answer
    x = 27,749.32

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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.