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Finding the Fourth Proportional to 491.10, 676.26 and 420.63

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Solution

The fourth proportional to 491.10, 676.26 and 420.63 is: 579.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.10 : 676.26 = 420.63 : x
  2. Step 2: Convert to fraction form
    491.10/676.26 = 420.63/x
  3. Step 3: Cross multiply
    491.10x = 676.26 × 420.63
  4. Step 4: Simplify right side
    491.10x = 284,455.24
  5. Step 5: Solve for x
    x = 284,455.24/491.10
  6. Step 6: Final answer
    x = 579.22

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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.