Home / 20,430.28-30,521.24-12,975.04

Finding the Fourth Proportional to 20,430.28, 30,521.24 and 12,975.04

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Solution

The fourth proportional to 20,430.28, 30,521.24 and 12,975.04 is: 19,383.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.28 : 30,521.24 = 12,975.04 : x
  2. Step 2: Convert to fraction form
    20,430.28/30,521.24 = 12,975.04/x
  3. Step 3: Cross multiply
    20,430.28x = 30,521.24 × 12,975.04
  4. Step 4: Simplify right side
    20,430.28x = 396,014,309.85
  5. Step 5: Solve for x
    x = 396,014,309.85/20,430.28
  6. Step 6: Final answer
    x = 19,383.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.