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Finding the Fourth Proportional to 20,969.88, 28,950.42 and 13,905.92

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Solution

The fourth proportional to 20,969.88, 28,950.42 and 13,905.92 is: 19,198.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.88 : 28,950.42 = 13,905.92 : x
  2. Step 2: Convert to fraction form
    20,969.88/28,950.42 = 13,905.92/x
  3. Step 3: Cross multiply
    20,969.88x = 28,950.42 × 13,905.92
  4. Step 4: Simplify right side
    20,969.88x = 402,582,224.49
  5. Step 5: Solve for x
    x = 402,582,224.49/20,969.88
  6. Step 6: Final answer
    x = 19,198.12

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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.