Home / 20,726.40-31,089.60-18,879.60

Finding the Fourth Proportional to 20,726.40, 31,089.60 and 18,879.60

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Solution

The fourth proportional to 20,726.40, 31,089.60 and 18,879.60 is: 28,319.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,726.40 : 31,089.60 = 18,879.60 : x
  2. Step 2: Convert to fraction form
    20,726.40/31,089.60 = 18,879.60/x
  3. Step 3: Cross multiply
    20,726.40x = 31,089.60 × 18,879.60
  4. Step 4: Simplify right side
    20,726.40x = 586,959,212.16
  5. Step 5: Solve for x
    x = 586,959,212.16/20,726.40
  6. Step 6: Final answer
    x = 28,319.40

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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.