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Finding the Fourth Proportional to 12,347.20, 18,520.80 and 9,431.20

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Solution

The fourth proportional to 12,347.20, 18,520.80 and 9,431.20 is: 14,146.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,347.20 : 18,520.80 = 9,431.20 : x
  2. Step 2: Convert to fraction form
    12,347.20/18,520.80 = 9,431.20/x
  3. Step 3: Cross multiply
    12,347.20x = 18,520.80 × 9,431.20
  4. Step 4: Simplify right side
    12,347.20x = 174,673,368.96
  5. Step 5: Solve for x
    x = 174,673,368.96/12,347.20
  6. Step 6: Final answer
    x = 14,146.80

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.