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Finding the Fourth Proportional to 957.48, 1,321.26 and 553.64

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Solution

The fourth proportional to 957.48, 1,321.26 and 553.64 is: 763.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.48 : 1,321.26 = 553.64 : x
  2. Step 2: Convert to fraction form
    957.48/1,321.26 = 553.64/x
  3. Step 3: Cross multiply
    957.48x = 1,321.26 × 553.64
  4. Step 4: Simplify right side
    957.48x = 731,502.39
  5. Step 5: Solve for x
    x = 731,502.39/957.48
  6. Step 6: Final answer
    x = 763.99

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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.