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Finding the Fourth Proportional to 940.14, 1,296.18 and 644.88

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Solution

The fourth proportional to 940.14, 1,296.18 and 644.88 is: 889.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.14 : 1,296.18 = 644.88 : x
  2. Step 2: Convert to fraction form
    940.14/1,296.18 = 644.88/x
  3. Step 3: Cross multiply
    940.14x = 1,296.18 × 644.88
  4. Step 4: Simplify right side
    940.14x = 835,880.56
  5. Step 5: Solve for x
    x = 835,880.56/940.14
  6. Step 6: Final answer
    x = 889.10

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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.