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Finding the Fourth Proportional to 1,911.99, 2,868.26 and 987.64

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Solution

The fourth proportional to 1,911.99, 2,868.26 and 987.64 is: 1,481.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.99 : 2,868.26 = 987.64 : x
  2. Step 2: Convert to fraction form
    1,911.99/2,868.26 = 987.64/x
  3. Step 3: Cross multiply
    1,911.99x = 2,868.26 × 987.64
  4. Step 4: Simplify right side
    1,911.99x = 2,832,808.31
  5. Step 5: Solve for x
    x = 2,832,808.31/1,911.99
  6. Step 6: Final answer
    x = 1,481.60

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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.