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Finding the Fourth Proportional to 13,638.68, 18,819.85 and 7,670.22

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Solution

The fourth proportional to 13,638.68, 18,819.85 and 7,670.22 is: 10,584.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.68 : 18,819.85 = 7,670.22 : x
  2. Step 2: Convert to fraction form
    13,638.68/18,819.85 = 7,670.22/x
  3. Step 3: Cross multiply
    13,638.68x = 18,819.85 × 7,670.22
  4. Step 4: Simplify right side
    13,638.68x = 144,352,420.36
  5. Step 5: Solve for x
    x = 144,352,420.36/13,638.68
  6. Step 6: Final answer
    x = 10,584.05

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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.