Home / 20,288.52-30,420.36-7,142.40

Finding the Fourth Proportional to 20,288.52, 30,420.36 and 7,142.40

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Solution

The fourth proportional to 20,288.52, 30,420.36 and 7,142.40 is: 10,709.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,288.52 : 30,420.36 = 7,142.40 : x
  2. Step 2: Convert to fraction form
    20,288.52/30,420.36 = 7,142.40/x
  3. Step 3: Cross multiply
    20,288.52x = 30,420.36 × 7,142.40
  4. Step 4: Simplify right side
    20,288.52x = 217,274,379.26
  5. Step 5: Solve for x
    x = 217,274,379.26/20,288.52
  6. Step 6: Final answer
    x = 10,709.23

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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.