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Finding the Fourth Proportional to 939.03, 1,405.60 and 644.81

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Solution

The fourth proportional to 939.03, 1,405.60 and 644.81 is: 965.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.03 : 1,405.60 = 644.81 : x
  2. Step 2: Convert to fraction form
    939.03/1,405.60 = 644.81/x
  3. Step 3: Cross multiply
    939.03x = 1,405.60 × 644.81
  4. Step 4: Simplify right side
    939.03x = 906,344.20
  5. Step 5: Solve for x
    x = 906,344.20/939.03
  6. Step 6: Final answer
    x = 965.19

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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.