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Finding the Fourth Proportional to 12,917.20, 19,391.40 and 8,237.20

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Solution

The fourth proportional to 12,917.20, 19,391.40 and 8,237.20 is: 12,365.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,917.20 : 19,391.40 = 8,237.20 : x
  2. Step 2: Convert to fraction form
    12,917.20/19,391.40 = 8,237.20/x
  3. Step 3: Cross multiply
    12,917.20x = 19,391.40 × 8,237.20
  4. Step 4: Simplify right side
    12,917.20x = 159,730,840.08
  5. Step 5: Solve for x
    x = 159,730,840.08/12,917.20
  6. Step 6: Final answer
    x = 12,365.75

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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.