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Finding the Fourth Proportional to 645, 888.86 and 411.72

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Solution

The fourth proportional to 645, 888.86 and 411.72 is: 567.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    645 : 888.86 = 411.72 : x
  2. Step 2: Convert to fraction form
    645/888.86 = 411.72/x
  3. Step 3: Cross multiply
    645x = 888.86 × 411.72
  4. Step 4: Simplify right side
    645x = 365,961.44
  5. Step 5: Solve for x
    x = 365,961.44/645
  6. Step 6: Final answer
    x = 567.38

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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.