Home / 12,318.21-18,478.31-4,918.61

Finding the Fourth Proportional to 12,318.21, 18,478.31 and 4,918.61

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Solution

The fourth proportional to 12,318.21, 18,478.31 and 4,918.61 is: 7,378.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,318.21 : 18,478.31 = 4,918.61 : x
  2. Step 2: Convert to fraction form
    12,318.21/18,478.31 = 4,918.61/x
  3. Step 3: Cross multiply
    12,318.21x = 18,478.31 × 4,918.61
  4. Step 4: Simplify right side
    12,318.21x = 90,887,600.35
  5. Step 5: Solve for x
    x = 90,887,600.35/12,318.21
  6. Step 6: Final answer
    x = 7,378.31

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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.