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Finding the Fourth Proportional to 860.72, 1,187.81 and 467.75

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Solution

The fourth proportional to 860.72, 1,187.81 and 467.75 is: 645.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.72 : 1,187.81 = 467.75 : x
  2. Step 2: Convert to fraction form
    860.72/1,187.81 = 467.75/x
  3. Step 3: Cross multiply
    860.72x = 1,187.81 × 467.75
  4. Step 4: Simplify right side
    860.72x = 555,589.85
  5. Step 5: Solve for x
    x = 555,589.85/860.72
  6. Step 6: Final answer
    x = 645.50

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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.