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Finding the Fourth Proportional to 676.50, 931.75 and 636.81

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Solution

The fourth proportional to 676.50, 931.75 and 636.81 is: 877.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.50 : 931.75 = 636.81 : x
  2. Step 2: Convert to fraction form
    676.50/931.75 = 636.81/x
  3. Step 3: Cross multiply
    676.50x = 931.75 × 636.81
  4. Step 4: Simplify right side
    676.50x = 593,347.72
  5. Step 5: Solve for x
    x = 593,347.72/676.50
  6. Step 6: Final answer
    x = 877.08

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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.