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Finding the Fourth Proportional to 12,490.92, 17,239.77 and 7,186.23

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Solution

The fourth proportional to 12,490.92, 17,239.77 and 7,186.23 is: 9,918.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,490.92 : 17,239.77 = 7,186.23 : x
  2. Step 2: Convert to fraction form
    12,490.92/17,239.77 = 7,186.23/x
  3. Step 3: Cross multiply
    12,490.92x = 17,239.77 × 7,186.23
  4. Step 4: Simplify right side
    12,490.92x = 123,888,952.37
  5. Step 5: Solve for x
    x = 123,888,952.37/12,490.92
  6. Step 6: Final answer
    x = 9,918.32

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Double scale
Find fourth proportional to 12,491.92, 17,241.15 and 7,187.23
Similar ratio
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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.