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Finding the Fourth Proportional to 31,300.40, 46,999.20 and 18,178.40

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Solution

The fourth proportional to 31,300.40, 46,999.20 and 18,178.40 is: 27,295.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,300.40 : 46,999.20 = 18,178.40 : x
  2. Step 2: Convert to fraction form
    31,300.40/46,999.20 = 18,178.40/x
  3. Step 3: Cross multiply
    31,300.40x = 46,999.20 × 18,178.40
  4. Step 4: Simplify right side
    31,300.40x = 854,370,257.28
  5. Step 5: Solve for x
    x = 854,370,257.28/31,300.40
  6. Step 6: Final answer
    x = 27,295.83

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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.