Home / 21,181.80-31,795.64-15,931.78

Finding the Fourth Proportional to 21,181.80, 31,795.64 and 15,931.78

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Solution

The fourth proportional to 21,181.80, 31,795.64 and 15,931.78 is: 23,914.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,181.80 : 31,795.64 = 15,931.78 : x
  2. Step 2: Convert to fraction form
    21,181.80/31,795.64 = 15,931.78/x
  3. Step 3: Cross multiply
    21,181.80x = 31,795.64 × 15,931.78
  4. Step 4: Simplify right side
    21,181.80x = 506,561,141.44
  5. Step 5: Solve for x
    x = 506,561,141.44/21,181.80
  6. Step 6: Final answer
    x = 23,914.92

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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.