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Finding the Fourth Proportional to 21,859.20, 30,661.20 and 21,859.20

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Solution

The fourth proportional to 21,859.20, 30,661.20 and 21,859.20 is: 30,661.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,859.20 : 30,661.20 = 21,859.20 : x
  2. Step 2: Convert to fraction form
    21,859.20/30,661.20 = 21,859.20/x
  3. Step 3: Cross multiply
    21,859.20x = 30,661.20 × 21,859.20
  4. Step 4: Simplify right side
    21,859.20x = 670,229,303.04
  5. Step 5: Solve for x
    x = 670,229,303.04/21,859.20
  6. Step 6: Final answer
    x = 30,661.20

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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.