Home / 21,134.18-31,699.44-12,811.75

Finding the Fourth Proportional to 21,134.18, 31,699.44 and 12,811.75

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Solution

The fourth proportional to 21,134.18, 31,699.44 and 12,811.75 is: 19,216.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,134.18 : 31,699.44 = 12,811.75 : x
  2. Step 2: Convert to fraction form
    21,134.18/31,699.44 = 12,811.75/x
  3. Step 3: Cross multiply
    21,134.18x = 31,699.44 × 12,811.75
  4. Step 4: Simplify right side
    21,134.18x = 406,125,221.17
  5. Step 5: Solve for x
    x = 406,125,221.17/21,134.18
  6. Step 6: Final answer
    x = 19,216.51

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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.