Home / 20,565.20-28,379.88-11,133.68

Finding the Fourth Proportional to 20,565.20, 28,379.88 and 11,133.68

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Solution

The fourth proportional to 20,565.20, 28,379.88 and 11,133.68 is: 15,364.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,565.20 : 28,379.88 = 11,133.68 : x
  2. Step 2: Convert to fraction form
    20,565.20/28,379.88 = 11,133.68/x
  3. Step 3: Cross multiply
    20,565.20x = 28,379.88 × 11,133.68
  4. Step 4: Simplify right side
    20,565.20x = 315,972,502.36
  5. Step 5: Solve for x
    x = 315,972,502.36/20,565.20
  6. Step 6: Final answer
    x = 15,364.43

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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.