Home / 21,188.94-31,795.57-7,871.19

Finding the Fourth Proportional to 21,188.94, 31,795.57 and 7,871.19

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Solution

The fourth proportional to 21,188.94, 31,795.57 and 7,871.19 is: 11,811.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,188.94 : 31,795.57 = 7,871.19 : x
  2. Step 2: Convert to fraction form
    21,188.94/31,795.57 = 7,871.19/x
  3. Step 3: Cross multiply
    21,188.94x = 31,795.57 × 7,871.19
  4. Step 4: Simplify right side
    21,188.94x = 250,268,972.63
  5. Step 5: Solve for x
    x = 250,268,972.63/21,188.94
  6. Step 6: Final answer
    x = 11,811.30

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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.