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Finding the Fourth Proportional to 957.39, 1,321.54 and 722.01

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Solution

The fourth proportional to 957.39, 1,321.54 and 722.01 is: 996.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.39 : 1,321.54 = 722.01 : x
  2. Step 2: Convert to fraction form
    957.39/1,321.54 = 722.01/x
  3. Step 3: Cross multiply
    957.39x = 1,321.54 × 722.01
  4. Step 4: Simplify right side
    957.39x = 954,171.46
  5. Step 5: Solve for x
    x = 954,171.46/957.39
  6. Step 6: Final answer
    x = 996.64

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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.