Home / 18,911.72-28,288.56-13,288.98

Finding the Fourth Proportional to 18,911.72, 28,288.56 and 13,288.98

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Solution

The fourth proportional to 18,911.72, 28,288.56 and 13,288.98 is: 19,877.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.72 : 28,288.56 = 13,288.98 : x
  2. Step 2: Convert to fraction form
    18,911.72/28,288.56 = 13,288.98/x
  3. Step 3: Cross multiply
    18,911.72x = 28,288.56 × 13,288.98
  4. Step 4: Simplify right side
    18,911.72x = 375,926,108.07
  5. Step 5: Solve for x
    x = 375,926,108.07/18,911.72
  6. Step 6: Final answer
    x = 19,877.95

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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.