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Finding the Fourth Proportional to 18,694.40, 28,041.60 and 9,459.20

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Solution

The fourth proportional to 18,694.40, 28,041.60 and 9,459.20 is: 14,188.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,694.40 : 28,041.60 = 9,459.20 : x
  2. Step 2: Convert to fraction form
    18,694.40/28,041.60 = 9,459.20/x
  3. Step 3: Cross multiply
    18,694.40x = 28,041.60 × 9,459.20
  4. Step 4: Simplify right side
    18,694.40x = 265,251,102.72
  5. Step 5: Solve for x
    x = 265,251,102.72/18,694.40
  6. Step 6: Final answer
    x = 14,188.80

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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.