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Finding the Fourth Proportional to 971.37, 1,339.38 and 639.27

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Solution

The fourth proportional to 971.37, 1,339.38 and 639.27 is: 881.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.37 : 1,339.38 = 639.27 : x
  2. Step 2: Convert to fraction form
    971.37/1,339.38 = 639.27/x
  3. Step 3: Cross multiply
    971.37x = 1,339.38 × 639.27
  4. Step 4: Simplify right side
    971.37x = 856,225.45
  5. Step 5: Solve for x
    x = 856,225.45/971.37
  6. Step 6: Final answer
    x = 881.46

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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.