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Finding the Fourth Proportional to 12,911.48, 17,817.11 and 7,245.70

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Solution

The fourth proportional to 12,911.48, 17,817.11 and 7,245.70 is: 9,998.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,911.48 : 17,817.11 = 7,245.70 : x
  2. Step 2: Convert to fraction form
    12,911.48/17,817.11 = 7,245.70/x
  3. Step 3: Cross multiply
    12,911.48x = 17,817.11 × 7,245.70
  4. Step 4: Simplify right side
    12,911.48x = 129,097,429.77
  5. Step 5: Solve for x
    x = 129,097,429.77/12,911.48
  6. Step 6: Final answer
    x = 9,998.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.