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Finding the Fourth Proportional to 18,720, 25,833.60 and 10,336.50

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Solution

The fourth proportional to 18,720, 25,833.60 and 10,336.50 is: 14,264.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720 : 25,833.60 = 10,336.50 : x
  2. Step 2: Convert to fraction form
    18,720/25,833.60 = 10,336.50/x
  3. Step 3: Cross multiply
    18,720x = 25,833.60 × 10,336.50
  4. Step 4: Simplify right side
    18,720x = 267,029,006.40
  5. Step 5: Solve for x
    x = 267,029,006.40/18,720
  6. Step 6: Final answer
    x = 14,264.37

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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.