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Finding the Fourth Proportional to 13,689.79, 18,891.90 and 7,721.44

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Solution

The fourth proportional to 13,689.79, 18,891.90 and 7,721.44 is: 10,655.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.79 : 18,891.90 = 7,721.44 : x
  2. Step 2: Convert to fraction form
    13,689.79/18,891.90 = 7,721.44/x
  3. Step 3: Cross multiply
    13,689.79x = 18,891.90 × 7,721.44
  4. Step 4: Simplify right side
    13,689.79x = 145,872,672.34
  5. Step 5: Solve for x
    x = 145,872,672.34/13,689.79
  6. Step 6: Final answer
    x = 10,655.58

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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.