Home / 21,129.09-31,662.18-19,261.98

Finding the Fourth Proportional to 21,129.09, 31,662.18 and 19,261.98

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Solution

The fourth proportional to 21,129.09, 31,662.18 and 19,261.98 is: 28,864.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.09 : 31,662.18 = 19,261.98 : x
  2. Step 2: Convert to fraction form
    21,129.09/31,662.18 = 19,261.98/x
  3. Step 3: Cross multiply
    21,129.09x = 31,662.18 × 19,261.98
  4. Step 4: Simplify right side
    21,129.09x = 609,876,277.92
  5. Step 5: Solve for x
    x = 609,876,277.92/21,129.09
  6. Step 6: Final answer
    x = 28,864.29

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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.