Home / 21,039.48-31,564.32-7,891.98

Finding the Fourth Proportional to 21,039.48, 31,564.32 and 7,891.98

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Solution

The fourth proportional to 21,039.48, 31,564.32 and 7,891.98 is: 11,839.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,039.48 : 31,564.32 = 7,891.98 : x
  2. Step 2: Convert to fraction form
    21,039.48/31,564.32 = 7,891.98/x
  3. Step 3: Cross multiply
    21,039.48x = 31,564.32 × 7,891.98
  4. Step 4: Simplify right side
    21,039.48x = 249,104,982.15
  5. Step 5: Solve for x
    x = 249,104,982.15/21,039.48
  6. Step 6: Final answer
    x = 11,839.88

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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.