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Finding the Fourth Proportional to 12,665.40, 18,998.10 and 3,431.40

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Solution

The fourth proportional to 12,665.40, 18,998.10 and 3,431.40 is: 5,147.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,665.40 : 18,998.10 = 3,431.40 : x
  2. Step 2: Convert to fraction form
    12,665.40/18,998.10 = 3,431.40/x
  3. Step 3: Cross multiply
    12,665.40x = 18,998.10 × 3,431.40
  4. Step 4: Simplify right side
    12,665.40x = 65,190,080.34
  5. Step 5: Solve for x
    x = 65,190,080.34/12,665.40
  6. Step 6: Final answer
    x = 5,147.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.