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Finding the Fourth Proportional to 21,918.88, 30,258.13 and 12,842.99

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Solution

The fourth proportional to 21,918.88, 30,258.13 and 12,842.99 is: 17,729.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,918.88 : 30,258.13 = 12,842.99 : x
  2. Step 2: Convert to fraction form
    21,918.88/30,258.13 = 12,842.99/x
  3. Step 3: Cross multiply
    21,918.88x = 30,258.13 × 12,842.99
  4. Step 4: Simplify right side
    21,918.88x = 388,604,701.69
  5. Step 5: Solve for x
    x = 388,604,701.69/21,918.88
  6. Step 6: Final answer
    x = 17,729.22

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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.