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Finding the Fourth Proportional to 12,917.20, 19,332.60 and 11,880.40

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Solution

The fourth proportional to 12,917.20, 19,332.60 and 11,880.40 is: 17,780.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,917.20 : 19,332.60 = 11,880.40 : x
  2. Step 2: Convert to fraction form
    12,917.20/19,332.60 = 11,880.40/x
  3. Step 3: Cross multiply
    12,917.20x = 19,332.60 × 11,880.40
  4. Step 4: Simplify right side
    12,917.20x = 229,679,021.04
  5. Step 5: Solve for x
    x = 229,679,021.04/12,917.20
  6. Step 6: Final answer
    x = 17,780.87

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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.