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Finding the Fourth Proportional to 1,428.01, 2,141.84 and 387.95

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Solution

The fourth proportional to 1,428.01, 2,141.84 and 387.95 is: 581.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.01 : 2,141.84 = 387.95 : x
  2. Step 2: Convert to fraction form
    1,428.01/2,141.84 = 387.95/x
  3. Step 3: Cross multiply
    1,428.01x = 2,141.84 × 387.95
  4. Step 4: Simplify right side
    1,428.01x = 830,926.83
  5. Step 5: Solve for x
    x = 830,926.83/1,428.01
  6. Step 6: Final answer
    x = 581.88

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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.