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Finding the Fourth Proportional to 18,405.21, 25,399.41 and 10,021.71

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Solution

The fourth proportional to 18,405.21, 25,399.41 and 10,021.71 is: 13,830.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,405.21 : 25,399.41 = 10,021.71 : x
  2. Step 2: Convert to fraction form
    18,405.21/25,399.41 = 10,021.71/x
  3. Step 3: Cross multiply
    18,405.21x = 25,399.41 × 10,021.71
  4. Step 4: Simplify right side
    18,405.21x = 254,545,521.19
  5. Step 5: Solve for x
    x = 254,545,521.19/18,405.21
  6. Step 6: Final answer
    x = 13,830.08

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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.