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Finding the Fourth Proportional to 18,756.75, 28,135.40 and 4,905.75

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Solution

The fourth proportional to 18,756.75, 28,135.40 and 4,905.75 is: 7,358.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,756.75 : 28,135.40 = 4,905.75 : x
  2. Step 2: Convert to fraction form
    18,756.75/28,135.40 = 4,905.75/x
  3. Step 3: Cross multiply
    18,756.75x = 28,135.40 × 4,905.75
  4. Step 4: Simplify right side
    18,756.75x = 138,025,214.02
  5. Step 5: Solve for x
    x = 138,025,214.02/18,756.75
  6. Step 6: Final answer
    x = 7,358.70

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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.