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Finding the Fourth Proportional to 20,573.76, 28,392 and 12,188.48

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Solution

The fourth proportional to 20,573.76, 28,392 and 12,188.48 is: 16,820.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,573.76 : 28,392 = 12,188.48 : x
  2. Step 2: Convert to fraction form
    20,573.76/28,392 = 12,188.48/x
  3. Step 3: Cross multiply
    20,573.76x = 28,392 × 12,188.48
  4. Step 4: Simplify right side
    20,573.76x = 346,055,324.16
  5. Step 5: Solve for x
    x = 346,055,324.16/20,573.76
  6. Step 6: Final answer
    x = 16,820.23

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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.