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Finding the Fourth Proportional to 971.44, 1,456.08 and 638.54

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Solution

The fourth proportional to 971.44, 1,456.08 and 638.54 is: 957.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.44 : 1,456.08 = 638.54 : x
  2. Step 2: Convert to fraction form
    971.44/1,456.08 = 638.54/x
  3. Step 3: Cross multiply
    971.44x = 1,456.08 × 638.54
  4. Step 4: Simplify right side
    971.44x = 929,765.32
  5. Step 5: Solve for x
    x = 929,765.32/971.44
  6. Step 6: Final answer
    x = 957.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.