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Finding the Fourth Proportional to 12,917.70, 18,110.70 and 12,917.70

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Solution

The fourth proportional to 12,917.70, 18,110.70 and 12,917.70 is: 18,110.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,917.70 : 18,110.70 = 12,917.70 : x
  2. Step 2: Convert to fraction form
    12,917.70/18,110.70 = 12,917.70/x
  3. Step 3: Cross multiply
    12,917.70x = 18,110.70 × 12,917.70
  4. Step 4: Simplify right side
    12,917.70x = 233,948,589.39
  5. Step 5: Solve for x
    x = 233,948,589.39/12,917.70
  6. Step 6: Final answer
    x = 18,110.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.