Home / 21,129.12-31,600.53-18,804.42

Finding the Fourth Proportional to 21,129.12, 31,600.53 and 18,804.42

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Solution

The fourth proportional to 21,129.12, 31,600.53 and 18,804.42 is: 28,123.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.12 : 31,600.53 = 18,804.42 : x
  2. Step 2: Convert to fraction form
    21,129.12/31,600.53 = 18,804.42/x
  3. Step 3: Cross multiply
    21,129.12x = 31,600.53 × 18,804.42
  4. Step 4: Simplify right side
    21,129.12x = 594,229,638.34
  5. Step 5: Solve for x
    x = 594,229,638.34/21,129.12
  6. Step 6: Final answer
    x = 28,123.73

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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.