Home / 20,458.91-28,223.76-13,288.32

Finding the Fourth Proportional to 20,458.91, 28,223.76 and 13,288.32

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Solution

The fourth proportional to 20,458.91, 28,223.76 and 13,288.32 is: 18,331.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,458.91 : 28,223.76 = 13,288.32 : x
  2. Step 2: Convert to fraction form
    20,458.91/28,223.76 = 13,288.32/x
  3. Step 3: Cross multiply
    20,458.91x = 28,223.76 × 13,288.32
  4. Step 4: Simplify right side
    20,458.91x = 375,046,213.36
  5. Step 5: Solve for x
    x = 375,046,213.36/20,458.91
  6. Step 6: Final answer
    x = 18,331.68

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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.