Home / 20,430.12-28,221.30-16,009.68

Finding the Fourth Proportional to 20,430.12, 28,221.30 and 16,009.68

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Solution

The fourth proportional to 20,430.12, 28,221.30 and 16,009.68 is: 22,115.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.12 : 28,221.30 = 16,009.68 : x
  2. Step 2: Convert to fraction form
    20,430.12/28,221.30 = 16,009.68/x
  3. Step 3: Cross multiply
    20,430.12x = 28,221.30 × 16,009.68
  4. Step 4: Simplify right side
    20,430.12x = 451,813,982.18
  5. Step 5: Solve for x
    x = 451,813,982.18/20,430.12
  6. Step 6: Final answer
    x = 22,115.09

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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.