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Finding the Fourth Proportional to 18,978.81, 28,485.57 and 9,625.28

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Solution

The fourth proportional to 18,978.81, 28,485.57 and 9,625.28 is: 14,446.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.81 : 28,485.57 = 9,625.28 : x
  2. Step 2: Convert to fraction form
    18,978.81/28,485.57 = 9,625.28/x
  3. Step 3: Cross multiply
    18,978.81x = 28,485.57 × 9,625.28
  4. Step 4: Simplify right side
    18,978.81x = 274,181,559.89
  5. Step 5: Solve for x
    x = 274,181,559.89/18,978.81
  6. Step 6: Final answer
    x = 14,446.72

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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.