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Finding the Fourth Proportional to 18,918.78, 28,395.70 and 9,565.42

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Solution

The fourth proportional to 18,918.78, 28,395.70 and 9,565.42 is: 14,356.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.78 : 28,395.70 = 9,565.42 : x
  2. Step 2: Convert to fraction form
    18,918.78/28,395.70 = 9,565.42/x
  3. Step 3: Cross multiply
    18,918.78x = 28,395.70 × 9,565.42
  4. Step 4: Simplify right side
    18,918.78x = 271,616,796.69
  5. Step 5: Solve for x
    x = 271,616,796.69/18,918.78
  6. Step 6: Final answer
    x = 14,356.99

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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.