Home / 30,885.21-42,629.22-20,289.20

Finding the Fourth Proportional to 30,885.21, 42,629.22 and 20,289.20

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Solution

The fourth proportional to 30,885.21, 42,629.22 and 20,289.20 is: 28,004.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,885.21 : 42,629.22 = 20,289.20 : x
  2. Step 2: Convert to fraction form
    30,885.21/42,629.22 = 20,289.20/x
  3. Step 3: Cross multiply
    30,885.21x = 42,629.22 × 20,289.20
  4. Step 4: Simplify right side
    30,885.21x = 864,912,557.28
  5. Step 5: Solve for x
    x = 864,912,557.28/30,885.21
  6. Step 6: Final answer
    x = 28,004.10

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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.