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Finding the Fourth Proportional to 1,428.57, 1,979.01 and 1,394.55

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Solution

The fourth proportional to 1,428.57, 1,979.01 and 1,394.55 is: 1,931.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.57 : 1,979.01 = 1,394.55 : x
  2. Step 2: Convert to fraction form
    1,428.57/1,979.01 = 1,394.55/x
  3. Step 3: Cross multiply
    1,428.57x = 1,979.01 × 1,394.55
  4. Step 4: Simplify right side
    1,428.57x = 2,759,828.40
  5. Step 5: Solve for x
    x = 2,759,828.40/1,428.57
  6. Step 6: Final answer
    x = 1,931.88

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.