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Finding the Fourth Proportional to 957.95, 1,321.31 and 638.94

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Solution

The fourth proportional to 957.95, 1,321.31 and 638.94 is: 881.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.95 : 1,321.31 = 638.94 : x
  2. Step 2: Convert to fraction form
    957.95/1,321.31 = 638.94/x
  3. Step 3: Cross multiply
    957.95x = 1,321.31 × 638.94
  4. Step 4: Simplify right side
    957.95x = 844,234.62
  5. Step 5: Solve for x
    x = 844,234.62/957.95
  6. Step 6: Final answer
    x = 881.30

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Double scale
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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.