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Finding the Fourth Proportional to 860.34, 1,287.42 and 745.18

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Solution

The fourth proportional to 860.34, 1,287.42 and 745.18 is: 1,115.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.34 : 1,287.42 = 745.18 : x
  2. Step 2: Convert to fraction form
    860.34/1,287.42 = 745.18/x
  3. Step 3: Cross multiply
    860.34x = 1,287.42 × 745.18
  4. Step 4: Simplify right side
    860.34x = 959,359.64
  5. Step 5: Solve for x
    x = 959,359.64/860.34
  6. Step 6: Final answer
    x = 1,115.09

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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.