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Finding the Fourth Proportional to 18,874.70, 28,291.28 and 7,775.33

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Solution

The fourth proportional to 18,874.70, 28,291.28 and 7,775.33 is: 11,654.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,874.70 : 28,291.28 = 7,775.33 : x
  2. Step 2: Convert to fraction form
    18,874.70/28,291.28 = 7,775.33/x
  3. Step 3: Cross multiply
    18,874.70x = 28,291.28 × 7,775.33
  4. Step 4: Simplify right side
    18,874.70x = 219,974,128.29
  5. Step 5: Solve for x
    x = 219,974,128.29/18,874.70
  6. Step 6: Final answer
    x = 11,654.45

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1.5x scale

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.