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Finding the Fourth Proportional to 12,390.77, 17,095.09 and 7,917.14

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Solution

The fourth proportional to 12,390.77, 17,095.09 and 7,917.14 is: 10,922.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.77 : 17,095.09 = 7,917.14 : x
  2. Step 2: Convert to fraction form
    12,390.77/17,095.09 = 7,917.14/x
  3. Step 3: Cross multiply
    12,390.77x = 17,095.09 × 7,917.14
  4. Step 4: Simplify right side
    12,390.77x = 135,344,135.37
  5. Step 5: Solve for x
    x = 135,344,135.37/12,390.77
  6. Step 6: Final answer
    x = 10,922.98

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Double scale
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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.