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Finding the Fourth Proportional to 8,956, 12,359.40 and 5,419.60

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Solution

The fourth proportional to 8,956, 12,359.40 and 5,419.60 is: 7,479.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,956 : 12,359.40 = 5,419.60 : x
  2. Step 2: Convert to fraction form
    8,956/12,359.40 = 5,419.60/x
  3. Step 3: Cross multiply
    8,956x = 12,359.40 × 5,419.60
  4. Step 4: Simplify right side
    8,956x = 66,983,004.24
  5. Step 5: Solve for x
    x = 66,983,004.24/8,956
  6. Step 6: Final answer
    x = 7,479.12

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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.