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Finding the Fourth Proportional to 1,871.88, 2,808.16 and 639.01

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Solution

The fourth proportional to 1,871.88, 2,808.16 and 639.01 is: 958.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.88 : 2,808.16 = 639.01 : x
  2. Step 2: Convert to fraction form
    1,871.88/2,808.16 = 639.01/x
  3. Step 3: Cross multiply
    1,871.88x = 2,808.16 × 639.01
  4. Step 4: Simplify right side
    1,871.88x = 1,794,427.54
  5. Step 5: Solve for x
    x = 1,794,427.54/1,871.88
  6. Step 6: Final answer
    x = 958.62

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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.