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Finding the Fourth Proportional to 939.47, 1,296.41 and 644.22

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Solution

The fourth proportional to 939.47, 1,296.41 and 644.22 is: 888.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.47 : 1,296.41 = 644.22 : x
  2. Step 2: Convert to fraction form
    939.47/1,296.41 = 644.22/x
  3. Step 3: Cross multiply
    939.47x = 1,296.41 × 644.22
  4. Step 4: Simplify right side
    939.47x = 835,170.03
  5. Step 5: Solve for x
    x = 835,170.03/939.47
  6. Step 6: Final answer
    x = 888.98

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Double scale
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1.5x scale

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.