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Finding the Fourth Proportional to 21,859.70, 30,661.90 and 21,859.70

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Solution

The fourth proportional to 21,859.70, 30,661.90 and 21,859.70 is: 30,661.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,859.70 : 30,661.90 = 21,859.70 : x
  2. Step 2: Convert to fraction form
    21,859.70/30,661.90 = 21,859.70/x
  3. Step 3: Cross multiply
    21,859.70x = 30,661.90 × 21,859.70
  4. Step 4: Simplify right side
    21,859.70x = 670,259,935.43
  5. Step 5: Solve for x
    x = 670,259,935.43/21,859.70
  6. Step 6: Final answer
    x = 30,661.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.