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Finding the Fourth Proportional to 13,689.15, 18,891.14 and 7,557.05

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Solution

The fourth proportional to 13,689.15, 18,891.14 and 7,557.05 is: 10,428.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.15 : 18,891.14 = 7,557.05 : x
  2. Step 2: Convert to fraction form
    13,689.15/18,891.14 = 7,557.05/x
  3. Step 3: Cross multiply
    13,689.15x = 18,891.14 × 7,557.05
  4. Step 4: Simplify right side
    13,689.15x = 142,761,157.30
  5. Step 5: Solve for x
    x = 142,761,157.30/13,689.15
  6. Step 6: Final answer
    x = 10,428.78

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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.