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Finding the Fourth Proportional to 694.17, 956.21 and 648.81

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Solution

The fourth proportional to 694.17, 956.21 and 648.81 is: 893.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.17 : 956.21 = 648.81 : x
  2. Step 2: Convert to fraction form
    694.17/956.21 = 648.81/x
  3. Step 3: Cross multiply
    694.17x = 956.21 × 648.81
  4. Step 4: Simplify right side
    694.17x = 620,395.37
  5. Step 5: Solve for x
    x = 620,395.37/694.17
  6. Step 6: Final answer
    x = 893.72

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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.