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Finding the Fourth Proportional to 18,965.70, 28,386.54 and 17,146.80

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Solution

The fourth proportional to 18,965.70, 28,386.54 and 17,146.80 is: 25,664.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,965.70 : 28,386.54 = 17,146.80 : x
  2. Step 2: Convert to fraction form
    18,965.70/28,386.54 = 17,146.80/x
  3. Step 3: Cross multiply
    18,965.70x = 28,386.54 × 17,146.80
  4. Step 4: Simplify right side
    18,965.70x = 486,738,324.07
  5. Step 5: Solve for x
    x = 486,738,324.07/18,965.70
  6. Step 6: Final answer
    x = 25,664.14

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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.