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Finding the Fourth Proportional to 18,993.12, 28,417.40 and 11,469

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Solution

The fourth proportional to 18,993.12, 28,417.40 and 11,469 is: 17,159.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,993.12 : 28,417.40 = 11,469 : x
  2. Step 2: Convert to fraction form
    18,993.12/28,417.40 = 11,469/x
  3. Step 3: Cross multiply
    18,993.12x = 28,417.40 × 11,469
  4. Step 4: Simplify right side
    18,993.12x = 325,919,160.60
  5. Step 5: Solve for x
    x = 325,919,160.60/18,993.12
  6. Step 6: Final answer
    x = 17,159.85

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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.