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Finding the Fourth Proportional to 957.88, 1,321.12 and 643.04

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Solution

The fourth proportional to 957.88, 1,321.12 and 643.04 is: 886.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.88 : 1,321.12 = 643.04 : x
  2. Step 2: Convert to fraction form
    957.88/1,321.12 = 643.04/x
  3. Step 3: Cross multiply
    957.88x = 1,321.12 × 643.04
  4. Step 4: Simplify right side
    957.88x = 849,533.00
  5. Step 5: Solve for x
    x = 849,533.00/957.88
  6. Step 6: Final answer
    x = 886.89

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Double scale
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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.