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Finding the Fourth Proportional to 491.10, 676.86 and 397.50

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Solution

The fourth proportional to 491.10, 676.86 and 397.50 is: 547.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.10 : 676.86 = 397.50 : x
  2. Step 2: Convert to fraction form
    491.10/676.86 = 397.50/x
  3. Step 3: Cross multiply
    491.10x = 676.86 × 397.50
  4. Step 4: Simplify right side
    491.10x = 269,051.85
  5. Step 5: Solve for x
    x = 269,051.85/491.10
  6. Step 6: Final answer
    x = 547.86

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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.