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Finding the Fourth Proportional to 645.88, 967.77 and 621.91

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Solution

The fourth proportional to 645.88, 967.77 and 621.91 is: 931.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.88 : 967.77 = 621.91 : x
  2. Step 2: Convert to fraction form
    645.88/967.77 = 621.91/x
  3. Step 3: Cross multiply
    645.88x = 967.77 × 621.91
  4. Step 4: Simplify right side
    645.88x = 601,865.84
  5. Step 5: Solve for x
    x = 601,865.84/645.88
  6. Step 6: Final answer
    x = 931.85

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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.