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Finding the Fourth Proportional to 1,067.82, 1,470.65 and 920.40

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Solution

The fourth proportional to 1,067.82, 1,470.65 and 920.40 is: 1,267.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,067.82 : 1,470.65 = 920.40 : x
  2. Step 2: Convert to fraction form
    1,067.82/1,470.65 = 920.40/x
  3. Step 3: Cross multiply
    1,067.82x = 1,470.65 × 920.40
  4. Step 4: Simplify right side
    1,067.82x = 1,353,586.26
  5. Step 5: Solve for x
    x = 1,353,586.26/1,067.82
  6. Step 6: Final answer
    x = 1,267.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.