Home / 20,430.36-28,238.22-18,855.72

Finding the Fourth Proportional to 20,430.36, 28,238.22 and 18,855.72

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Solution

The fourth proportional to 20,430.36, 28,238.22 and 18,855.72 is: 26,061.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.36 : 28,238.22 = 18,855.72 : x
  2. Step 2: Convert to fraction form
    20,430.36/28,238.22 = 18,855.72/x
  3. Step 3: Cross multiply
    20,430.36x = 28,238.22 × 18,855.72
  4. Step 4: Simplify right side
    20,430.36x = 532,451,969.62
  5. Step 5: Solve for x
    x = 532,451,969.62/20,430.36
  6. Step 6: Final answer
    x = 26,061.80

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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.