Home / 21,186.88-31,782.18-7,860.03

Finding the Fourth Proportional to 21,186.88, 31,782.18 and 7,860.03

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Solution

The fourth proportional to 21,186.88, 31,782.18 and 7,860.03 is: 11,790.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.88 : 31,782.18 = 7,860.03 : x
  2. Step 2: Convert to fraction form
    21,186.88/31,782.18 = 7,860.03/x
  3. Step 3: Cross multiply
    21,186.88x = 31,782.18 × 7,860.03
  4. Step 4: Simplify right side
    21,186.88x = 249,808,798.56
  5. Step 5: Solve for x
    x = 249,808,798.56/21,186.88
  6. Step 6: Final answer
    x = 11,790.73

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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.