Home / 20,983.37-31,459.34-12,661.42

Finding the Fourth Proportional to 20,983.37, 31,459.34 and 12,661.42

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Solution

The fourth proportional to 20,983.37, 31,459.34 and 12,661.42 is: 18,982.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,983.37 : 31,459.34 = 12,661.42 : x
  2. Step 2: Convert to fraction form
    20,983.37/31,459.34 = 12,661.42/x
  3. Step 3: Cross multiply
    20,983.37x = 31,459.34 × 12,661.42
  4. Step 4: Simplify right side
    20,983.37x = 398,319,774.71
  5. Step 5: Solve for x
    x = 398,319,774.71/20,983.37
  6. Step 6: Final answer
    x = 18,982.64

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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.