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Finding the Fourth Proportional to 645.21, 966.60 and 572.31

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Solution

The fourth proportional to 645.21, 966.60 and 572.31 is: 857.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.21 : 966.60 = 572.31 : x
  2. Step 2: Convert to fraction form
    645.21/966.60 = 572.31/x
  3. Step 3: Cross multiply
    645.21x = 966.60 × 572.31
  4. Step 4: Simplify right side
    645.21x = 553,194.85
  5. Step 5: Solve for x
    x = 553,194.85/645.21
  6. Step 6: Final answer
    x = 857.39

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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.