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Finding the Fourth Proportional to 971.95, 1,456.83 and 639.04

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Solution

The fourth proportional to 971.95, 1,456.83 and 639.04 is: 957.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.95 : 1,456.83 = 639.04 : x
  2. Step 2: Convert to fraction form
    971.95/1,456.83 = 639.04/x
  3. Step 3: Cross multiply
    971.95x = 1,456.83 × 639.04
  4. Step 4: Simplify right side
    971.95x = 930,972.64
  5. Step 5: Solve for x
    x = 930,972.64/971.95
  6. Step 6: Final answer
    x = 957.84

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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.