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Finding the Fourth Proportional to 12,339.60, 18,511.80 and 5,319.60

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Solution

The fourth proportional to 12,339.60, 18,511.80 and 5,319.60 is: 7,980.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,339.60 : 18,511.80 = 5,319.60 : x
  2. Step 2: Convert to fraction form
    12,339.60/18,511.80 = 5,319.60/x
  3. Step 3: Cross multiply
    12,339.60x = 18,511.80 × 5,319.60
  4. Step 4: Simplify right side
    12,339.60x = 98,475,371.28
  5. Step 5: Solve for x
    x = 98,475,371.28/12,339.60
  6. Step 6: Final answer
    x = 7,980.43

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1.5x scale

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.