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Finding the Fourth Proportional to 18,818.64, 25,958.28 and 12,445.20

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Solution

The fourth proportional to 18,818.64, 25,958.28 and 12,445.20 is: 17,166.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,818.64 : 25,958.28 = 12,445.20 : x
  2. Step 2: Convert to fraction form
    18,818.64/25,958.28 = 12,445.20/x
  3. Step 3: Cross multiply
    18,818.64x = 25,958.28 × 12,445.20
  4. Step 4: Simplify right side
    18,818.64x = 323,055,986.26
  5. Step 5: Solve for x
    x = 323,055,986.26/18,818.64
  6. Step 6: Final answer
    x = 17,166.81

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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.