Home / 30,967.99-42,753.56-20,388.38

Finding the Fourth Proportional to 30,967.99, 42,753.56 and 20,388.38

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Solution

The fourth proportional to 30,967.99, 42,753.56 and 20,388.38 is: 28,147.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,967.99 : 42,753.56 = 20,388.38 : x
  2. Step 2: Convert to fraction form
    30,967.99/42,753.56 = 20,388.38/x
  3. Step 3: Cross multiply
    30,967.99x = 42,753.56 × 20,388.38
  4. Step 4: Simplify right side
    30,967.99x = 871,675,511.92
  5. Step 5: Solve for x
    x = 871,675,511.92/30,967.99
  6. Step 6: Final answer
    x = 28,147.63

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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.