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Finding the Fourth Proportional to 854.87, 1,180.50 and 644.69

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Solution

The fourth proportional to 854.87, 1,180.50 and 644.69 is: 890.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.87 : 1,180.50 = 644.69 : x
  2. Step 2: Convert to fraction form
    854.87/1,180.50 = 644.69/x
  3. Step 3: Cross multiply
    854.87x = 1,180.50 × 644.69
  4. Step 4: Simplify right side
    854.87x = 761,052.25
  5. Step 5: Solve for x
    x = 761,052.25/854.87
  6. Step 6: Final answer
    x = 890.25

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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.