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Finding the Fourth Proportional to 1,378.62, 2,067.39 and 545.40

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Solution

The fourth proportional to 1,378.62, 2,067.39 and 545.40 is: 817.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.62 : 2,067.39 = 545.40 : x
  2. Step 2: Convert to fraction form
    1,378.62/2,067.39 = 545.40/x
  3. Step 3: Cross multiply
    1,378.62x = 2,067.39 × 545.40
  4. Step 4: Simplify right side
    1,378.62x = 1,127,554.51
  5. Step 5: Solve for x
    x = 1,127,554.51/1,378.62
  6. Step 6: Final answer
    x = 817.89

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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.