Home / 12,942.96-17,861.40-7,278

Finding the Fourth Proportional to 12,942.96, 17,861.40 and 7,278

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Solution

The fourth proportional to 12,942.96, 17,861.40 and 7,278 is: 10,043.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,942.96 : 17,861.40 = 7,278 : x
  2. Step 2: Convert to fraction form
    12,942.96/17,861.40 = 7,278/x
  3. Step 3: Cross multiply
    12,942.96x = 17,861.40 × 7,278
  4. Step 4: Simplify right side
    12,942.96x = 129,995,269.20
  5. Step 5: Solve for x
    x = 129,995,269.20/12,942.96
  6. Step 6: Final answer
    x = 10,043.70

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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.