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Finding the Fourth Proportional to 11,390.88, 17,088.16 and 3,995.20

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Solution

The fourth proportional to 11,390.88, 17,088.16 and 3,995.20 is: 5,993.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,390.88 : 17,088.16 = 3,995.20 : x
  2. Step 2: Convert to fraction form
    11,390.88/17,088.16 = 3,995.20/x
  3. Step 3: Cross multiply
    11,390.88x = 17,088.16 × 3,995.20
  4. Step 4: Simplify right side
    11,390.88x = 68,270,616.83
  5. Step 5: Solve for x
    x = 68,270,616.83/11,390.88
  6. Step 6: Final answer
    x = 5,993.45

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Half scale
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Double scale
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Similar ratio
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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.