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Finding the Fourth Proportional to 21,821.67, 30,109.37 and 13,860.99

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Solution

The fourth proportional to 21,821.67, 30,109.37 and 13,860.99 is: 19,125.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.67 : 30,109.37 = 13,860.99 : x
  2. Step 2: Convert to fraction form
    21,821.67/30,109.37 = 13,860.99/x
  3. Step 3: Cross multiply
    21,821.67x = 30,109.37 × 13,860.99
  4. Step 4: Simplify right side
    21,821.67x = 417,345,607.17
  5. Step 5: Solve for x
    x = 417,345,607.17/21,821.67
  6. Step 6: Final answer
    x = 19,125.28

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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.