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Finding the Fourth Proportional to 18,666.10, 28,031.55 and 9,918.10

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Solution

The fourth proportional to 18,666.10, 28,031.55 and 9,918.10 is: 14,894.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,666.10 : 28,031.55 = 9,918.10 : x
  2. Step 2: Convert to fraction form
    18,666.10/28,031.55 = 9,918.10/x
  3. Step 3: Cross multiply
    18,666.10x = 28,031.55 × 9,918.10
  4. Step 4: Simplify right side
    18,666.10x = 278,019,716.06
  5. Step 5: Solve for x
    x = 278,019,716.06/18,666.10
  6. Step 6: Final answer
    x = 14,894.37

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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.