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Finding the Fourth Proportional to 1,992.16, 2,987.28 and 837.28

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Solution

The fourth proportional to 1,992.16, 2,987.28 and 837.28 is: 1,255.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.16 : 2,987.28 = 837.28 : x
  2. Step 2: Convert to fraction form
    1,992.16/2,987.28 = 837.28/x
  3. Step 3: Cross multiply
    1,992.16x = 2,987.28 × 837.28
  4. Step 4: Simplify right side
    1,992.16x = 2,501,189.80
  5. Step 5: Solve for x
    x = 2,501,189.80/1,992.16
  6. Step 6: Final answer
    x = 1,255.52

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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.