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Finding the Fourth Proportional to 1,991.36, 2,987.40 and 896.24

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Solution

The fourth proportional to 1,991.36, 2,987.40 and 896.24 is: 1,344.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.36 : 2,987.40 = 896.24 : x
  2. Step 2: Convert to fraction form
    1,991.36/2,987.40 = 896.24/x
  3. Step 3: Cross multiply
    1,991.36x = 2,987.40 × 896.24
  4. Step 4: Simplify right side
    1,991.36x = 2,677,427.38
  5. Step 5: Solve for x
    x = 2,677,427.38/1,991.36
  6. Step 6: Final answer
    x = 1,344.52

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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.