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Finding the Fourth Proportional to 12,172.72, 18,259.10 and 2,938.72

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Solution

The fourth proportional to 12,172.72, 18,259.10 and 2,938.72 is: 4,408.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,172.72 : 18,259.10 = 2,938.72 : x
  2. Step 2: Convert to fraction form
    12,172.72/18,259.10 = 2,938.72/x
  3. Step 3: Cross multiply
    12,172.72x = 18,259.10 × 2,938.72
  4. Step 4: Simplify right side
    12,172.72x = 53,658,382.35
  5. Step 5: Solve for x
    x = 53,658,382.35/12,172.72
  6. Step 6: Final answer
    x = 4,408.08

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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.