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Finding the Fourth Proportional to 13,689.39, 18,891.33 and 7,721.04

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Solution

The fourth proportional to 13,689.39, 18,891.33 and 7,721.04 is: 10,655.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.39 : 18,891.33 = 7,721.04 : x
  2. Step 2: Convert to fraction form
    13,689.39/18,891.33 = 7,721.04/x
  3. Step 3: Cross multiply
    13,689.39x = 18,891.33 × 7,721.04
  4. Step 4: Simplify right side
    13,689.39x = 145,860,714.58
  5. Step 5: Solve for x
    x = 145,860,714.58/13,689.39
  6. Step 6: Final answer
    x = 10,655.02

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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.