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Finding the Fourth Proportional to 18,813.75, 25,953.75 and 15,828.45

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Solution

The fourth proportional to 18,813.75, 25,953.75 and 15,828.45 is: 21,835.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,813.75 : 25,953.75 = 15,828.45 : x
  2. Step 2: Convert to fraction form
    18,813.75/25,953.75 = 15,828.45/x
  3. Step 3: Cross multiply
    18,813.75x = 25,953.75 × 15,828.45
  4. Step 4: Simplify right side
    18,813.75x = 410,807,634.19
  5. Step 5: Solve for x
    x = 410,807,634.19/18,813.75
  6. Step 6: Final answer
    x = 21,835.50

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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.