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Finding the Fourth Proportional to 667.20, 914.85 and 644.01

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Solution

The fourth proportional to 667.20, 914.85 and 644.01 is: 883.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.20 : 914.85 = 644.01 : x
  2. Step 2: Convert to fraction form
    667.20/914.85 = 644.01/x
  3. Step 3: Cross multiply
    667.20x = 914.85 × 644.01
  4. Step 4: Simplify right side
    667.20x = 589,172.55
  5. Step 5: Solve for x
    x = 589,172.55/667.20
  6. Step 6: Final answer
    x = 883.05

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.