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Finding the Fourth Proportional to 18,415.71, 25,416.42 and 10,859.64

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Solution

The fourth proportional to 18,415.71, 25,416.42 and 10,859.64 is: 14,987.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,415.71 : 25,416.42 = 10,859.64 : x
  2. Step 2: Convert to fraction form
    18,415.71/25,416.42 = 10,859.64/x
  3. Step 3: Cross multiply
    18,415.71x = 25,416.42 × 10,859.64
  4. Step 4: Simplify right side
    18,415.71x = 276,013,171.29
  5. Step 5: Solve for x
    x = 276,013,171.29/18,415.71
  6. Step 6: Final answer
    x = 14,987.92

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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.