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Finding the Fourth Proportional to 18,897.48, 28,321.56 and 7,791.48

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Solution

The fourth proportional to 18,897.48, 28,321.56 and 7,791.48 is: 11,677.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,897.48 : 28,321.56 = 7,791.48 : x
  2. Step 2: Convert to fraction form
    18,897.48/28,321.56 = 7,791.48/x
  3. Step 3: Cross multiply
    18,897.48x = 28,321.56 × 7,791.48
  4. Step 4: Simplify right side
    18,897.48x = 220,666,868.31
  5. Step 5: Solve for x
    x = 220,666,868.31/18,897.48
  6. Step 6: Final answer
    x = 11,677.05

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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.