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Finding the Fourth Proportional to 1,067.18, 1,470.02 and 786.65

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Solution

The fourth proportional to 1,067.18, 1,470.02 and 786.65 is: 1,083.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,067.18 : 1,470.02 = 786.65 : x
  2. Step 2: Convert to fraction form
    1,067.18/1,470.02 = 786.65/x
  3. Step 3: Cross multiply
    1,067.18x = 1,470.02 × 786.65
  4. Step 4: Simplify right side
    1,067.18x = 1,156,379.95
  5. Step 5: Solve for x
    x = 1,156,379.95/1,067.18
  6. Step 6: Final answer
    x = 1,083.59

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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.