Home / 20,430.72-30,655.44-12,127.20

Finding the Fourth Proportional to 20,430.72, 30,655.44 and 12,127.20

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Solution

The fourth proportional to 20,430.72, 30,655.44 and 12,127.20 is: 18,196.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.72 : 30,655.44 = 12,127.20 : x
  2. Step 2: Convert to fraction form
    20,430.72/30,655.44 = 12,127.20/x
  3. Step 3: Cross multiply
    20,430.72x = 30,655.44 × 12,127.20
  4. Step 4: Simplify right side
    20,430.72x = 371,764,651.97
  5. Step 5: Solve for x
    x = 371,764,651.97/20,430.72
  6. Step 6: Final answer
    x = 18,196.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.