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Finding the Fourth Proportional to 13,689.98, 18,891.50 and 7,721.63

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Solution

The fourth proportional to 13,689.98, 18,891.50 and 7,721.63 is: 10,655.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.98 : 18,891.50 = 7,721.63 : x
  2. Step 2: Convert to fraction form
    13,689.98/18,891.50 = 7,721.63/x
  3. Step 3: Cross multiply
    13,689.98x = 18,891.50 × 7,721.63
  4. Step 4: Simplify right side
    13,689.98x = 145,873,040.08
  5. Step 5: Solve for x
    x = 145,873,040.08/13,689.98
  6. Step 6: Final answer
    x = 10,655.46

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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.