Home / 21,265.75-31,887.90-12,383.95

Finding the Fourth Proportional to 21,265.75, 31,887.90 and 12,383.95

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Solution

The fourth proportional to 21,265.75, 31,887.90 and 12,383.95 is: 18,569.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,265.75 : 31,887.90 = 12,383.95 : x
  2. Step 2: Convert to fraction form
    21,265.75/31,887.90 = 12,383.95/x
  3. Step 3: Cross multiply
    21,265.75x = 31,887.90 × 12,383.95
  4. Step 4: Simplify right side
    21,265.75x = 394,898,159.21
  5. Step 5: Solve for x
    x = 394,898,159.21/21,265.75
  6. Step 6: Final answer
    x = 18,569.68

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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.