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Finding the Fourth Proportional to 20,879.16, 28,806.90 and 12,918.60

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Solution

The fourth proportional to 20,879.16, 28,806.90 and 12,918.60 is: 17,823.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.16 : 28,806.90 = 12,918.60 : x
  2. Step 2: Convert to fraction form
    20,879.16/28,806.90 = 12,918.60/x
  3. Step 3: Cross multiply
    20,879.16x = 28,806.90 × 12,918.60
  4. Step 4: Simplify right side
    20,879.16x = 372,144,818.34
  5. Step 5: Solve for x
    x = 372,144,818.34/20,879.16
  6. Step 6: Final answer
    x = 17,823.74

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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.