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Finding the Fourth Proportional to 957.16, 1,321.38 and 644.07

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Solution

The fourth proportional to 957.16, 1,321.38 and 644.07 is: 889.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.16 : 1,321.38 = 644.07 : x
  2. Step 2: Convert to fraction form
    957.16/1,321.38 = 644.07/x
  3. Step 3: Cross multiply
    957.16x = 1,321.38 × 644.07
  4. Step 4: Simplify right side
    957.16x = 851,062.83
  5. Step 5: Solve for x
    x = 851,062.83/957.16
  6. Step 6: Final answer
    x = 889.15

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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.