Home / 12,687.18-19,030.80-3,921.90

Finding the Fourth Proportional to 12,687.18, 19,030.80 and 3,921.90

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Solution

The fourth proportional to 12,687.18, 19,030.80 and 3,921.90 is: 5,882.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,687.18 : 19,030.80 = 3,921.90 : x
  2. Step 2: Convert to fraction form
    12,687.18/19,030.80 = 3,921.90/x
  3. Step 3: Cross multiply
    12,687.18x = 19,030.80 × 3,921.90
  4. Step 4: Simplify right side
    12,687.18x = 74,636,894.52
  5. Step 5: Solve for x
    x = 74,636,894.52/12,687.18
  6. Step 6: Final answer
    x = 5,882.86

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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.