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Finding the Fourth Proportional to 7,178.78, 9,907.16 and 3,992.11

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Solution

The fourth proportional to 7,178.78, 9,907.16 and 3,992.11 is: 5,509.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,178.78 : 9,907.16 = 3,992.11 : x
  2. Step 2: Convert to fraction form
    7,178.78/9,907.16 = 3,992.11/x
  3. Step 3: Cross multiply
    7,178.78x = 9,907.16 × 3,992.11
  4. Step 4: Simplify right side
    7,178.78x = 39,550,403.01
  5. Step 5: Solve for x
    x = 39,550,403.01/7,178.78
  6. Step 6: Final answer
    x = 5,509.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.