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Finding the Fourth Proportional to 7,178.75, 9,905.79 and 4,192.41

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Solution

The fourth proportional to 7,178.75, 9,905.79 and 4,192.41 is: 5,785.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,178.75 : 9,905.79 = 4,192.41 : x
  2. Step 2: Convert to fraction form
    7,178.75/9,905.79 = 4,192.41/x
  3. Step 3: Cross multiply
    7,178.75x = 9,905.79 × 4,192.41
  4. Step 4: Simplify right side
    7,178.75x = 41,529,133.05
  5. Step 5: Solve for x
    x = 41,529,133.05/7,178.75
  6. Step 6: Final answer
    x = 5,785.01

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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.