Home / 21,029.76-31,544.51-7,872.80

Finding the Fourth Proportional to 21,029.76, 31,544.51 and 7,872.80

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Solution

The fourth proportional to 21,029.76, 31,544.51 and 7,872.80 is: 11,809.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,029.76 : 31,544.51 = 7,872.80 : x
  2. Step 2: Convert to fraction form
    21,029.76/31,544.51 = 7,872.80/x
  3. Step 3: Cross multiply
    21,029.76x = 31,544.51 × 7,872.80
  4. Step 4: Simplify right side
    21,029.76x = 248,343,421.24
  5. Step 5: Solve for x
    x = 248,343,421.24/21,029.76
  6. Step 6: Final answer
    x = 11,809.14

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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.