Home / 20,964.84-28,938.23-13,431.43

Finding the Fourth Proportional to 20,964.84, 28,938.23 and 13,431.43

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Solution

The fourth proportional to 20,964.84, 28,938.23 and 13,431.43 is: 18,539.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,964.84 : 28,938.23 = 13,431.43 : x
  2. Step 2: Convert to fraction form
    20,964.84/28,938.23 = 13,431.43/x
  3. Step 3: Cross multiply
    20,964.84x = 28,938.23 × 13,431.43
  4. Step 4: Simplify right side
    20,964.84x = 388,681,810.57
  5. Step 5: Solve for x
    x = 388,681,810.57/20,964.84
  6. Step 6: Final answer
    x = 18,539.70

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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.