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Finding the Fourth Proportional to 13,955.14, 20,939.88 and 7,713.98

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Solution

The fourth proportional to 13,955.14, 20,939.88 and 7,713.98 is: 11,574.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,955.14 : 20,939.88 = 7,713.98 : x
  2. Step 2: Convert to fraction form
    13,955.14/20,939.88 = 7,713.98/x
  3. Step 3: Cross multiply
    13,955.14x = 20,939.88 × 7,713.98
  4. Step 4: Simplify right side
    13,955.14x = 161,529,815.52
  5. Step 5: Solve for x
    x = 161,529,815.52/13,955.14
  6. Step 6: Final answer
    x = 11,574.93

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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.