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Finding the Fourth Proportional to 1,428.01, 2,142.02 and 987.88

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Solution

The fourth proportional to 1,428.01, 2,142.02 and 987.88 is: 1,481.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.01 : 2,142.02 = 987.88 : x
  2. Step 2: Convert to fraction form
    1,428.01/2,142.02 = 987.88/x
  3. Step 3: Cross multiply
    1,428.01x = 2,142.02 × 987.88
  4. Step 4: Simplify right side
    1,428.01x = 2,116,058.72
  5. Step 5: Solve for x
    x = 2,116,058.72/1,428.01
  6. Step 6: Final answer
    x = 1,481.82

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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.