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Finding the Fourth Proportional to 958.72, 1,322.31 and 644.34

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Solution

The fourth proportional to 958.72, 1,322.31 and 644.34 is: 888.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.72 : 1,322.31 = 644.34 : x
  2. Step 2: Convert to fraction form
    958.72/1,322.31 = 644.34/x
  3. Step 3: Cross multiply
    958.72x = 1,322.31 × 644.34
  4. Step 4: Simplify right side
    958.72x = 852,017.23
  5. Step 5: Solve for x
    x = 852,017.23/958.72
  6. Step 6: Final answer
    x = 888.70

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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.