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Finding the Fourth Proportional to 12,909.60, 19,359.60 and 5,116.80

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Solution

The fourth proportional to 12,909.60, 19,359.60 and 5,116.80 is: 7,673.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,909.60 : 19,359.60 = 5,116.80 : x
  2. Step 2: Convert to fraction form
    12,909.60/19,359.60 = 5,116.80/x
  3. Step 3: Cross multiply
    12,909.60x = 19,359.60 × 5,116.80
  4. Step 4: Simplify right side
    12,909.60x = 99,059,201.28
  5. Step 5: Solve for x
    x = 99,059,201.28/12,909.60
  6. Step 6: Final answer
    x = 7,673.30

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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.