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Finding the Fourth Proportional to 13,990.78, 19,302.92 and 7,940.02

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Solution

The fourth proportional to 13,990.78, 19,302.92 and 7,940.02 is: 10,954.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.78 : 19,302.92 = 7,940.02 : x
  2. Step 2: Convert to fraction form
    13,990.78/19,302.92 = 7,940.02/x
  3. Step 3: Cross multiply
    13,990.78x = 19,302.92 × 7,940.02
  4. Step 4: Simplify right side
    13,990.78x = 153,265,570.86
  5. Step 5: Solve for x
    x = 153,265,570.86/13,990.78
  6. Step 6: Final answer
    x = 10,954.76

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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.