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Finding the Fourth Proportional to 12,665.96, 18,987.32 and 4,868.90

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Solution

The fourth proportional to 12,665.96, 18,987.32 and 4,868.90 is: 7,298.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,665.96 : 18,987.32 = 4,868.90 : x
  2. Step 2: Convert to fraction form
    12,665.96/18,987.32 = 4,868.90/x
  3. Step 3: Cross multiply
    12,665.96x = 18,987.32 × 4,868.90
  4. Step 4: Simplify right side
    12,665.96x = 92,447,362.35
  5. Step 5: Solve for x
    x = 92,447,362.35/12,665.96
  6. Step 6: Final answer
    x = 7,298.88

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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.