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Finding the Fourth Proportional to 20,618.49, 28,454.21 and 12,120.49

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Solution

The fourth proportional to 20,618.49, 28,454.21 and 12,120.49 is: 16,726.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618.49 : 28,454.21 = 12,120.49 : x
  2. Step 2: Convert to fraction form
    20,618.49/28,454.21 = 12,120.49/x
  3. Step 3: Cross multiply
    20,618.49x = 28,454.21 × 12,120.49
  4. Step 4: Simplify right side
    20,618.49x = 344,878,967.76
  5. Step 5: Solve for x
    x = 344,878,967.76/20,618.49
  6. Step 6: Final answer
    x = 16,726.68

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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.