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Finding the Fourth Proportional to 17,280.75, 25,920.95 and 7,918.11

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Solution

The fourth proportional to 17,280.75, 25,920.95 and 7,918.11 is: 11,877.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,280.75 : 25,920.95 = 7,918.11 : x
  2. Step 2: Convert to fraction form
    17,280.75/25,920.95 = 7,918.11/x
  3. Step 3: Cross multiply
    17,280.75x = 25,920.95 × 7,918.11
  4. Step 4: Simplify right side
    17,280.75x = 205,244,933.40
  5. Step 5: Solve for x
    x = 205,244,933.40/17,280.75
  6. Step 6: Final answer
    x = 11,877.08

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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.