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Finding the Fourth Proportional to 3,551.95, 5,321.11 and 1,987.21

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Solution

The fourth proportional to 3,551.95, 5,321.11 and 1,987.21 is: 2,977.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,551.95 : 5,321.11 = 1,987.21 : x
  2. Step 2: Convert to fraction form
    3,551.95/5,321.11 = 1,987.21/x
  3. Step 3: Cross multiply
    3,551.95x = 5,321.11 × 1,987.21
  4. Step 4: Simplify right side
    3,551.95x = 10,574,164.69
  5. Step 5: Solve for x
    x = 10,574,164.69/3,551.95
  6. Step 6: Final answer
    x = 2,977.00

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Double scale
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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.