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Finding the Fourth Proportional to 612.98, 917.91 and 491.48

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Solution

The fourth proportional to 612.98, 917.91 and 491.48 is: 735.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.98 : 917.91 = 491.48 : x
  2. Step 2: Convert to fraction form
    612.98/917.91 = 491.48/x
  3. Step 3: Cross multiply
    612.98x = 917.91 × 491.48
  4. Step 4: Simplify right side
    612.98x = 451,129.82
  5. Step 5: Solve for x
    x = 451,129.82/612.98
  6. Step 6: Final answer
    x = 735.97

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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.