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Finding the Fourth Proportional to 958.64, 1,322.70 and 644.49

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Solution

The fourth proportional to 958.64, 1,322.70 and 644.49 is: 889.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.64 : 1,322.70 = 644.49 : x
  2. Step 2: Convert to fraction form
    958.64/1,322.70 = 644.49/x
  3. Step 3: Cross multiply
    958.64x = 1,322.70 × 644.49
  4. Step 4: Simplify right side
    958.64x = 852,464.51
  5. Step 5: Solve for x
    x = 852,464.51/958.64
  6. Step 6: Final answer
    x = 889.25

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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.