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Finding the Fourth Proportional to 18,415.60, 25,422.08 and 10,859.40

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Solution

The fourth proportional to 18,415.60, 25,422.08 and 10,859.40 is: 14,991.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,415.60 : 25,422.08 = 10,859.40 : x
  2. Step 2: Convert to fraction form
    18,415.60/25,422.08 = 10,859.40/x
  3. Step 3: Cross multiply
    18,415.60x = 25,422.08 × 10,859.40
  4. Step 4: Simplify right side
    18,415.60x = 276,068,535.55
  5. Step 5: Solve for x
    x = 276,068,535.55/18,415.60
  6. Step 6: Final answer
    x = 14,991.01

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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.