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Finding the Fourth Proportional to 491.94, 679.59 and 405.54

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Solution

The fourth proportional to 491.94, 679.59 and 405.54 is: 560.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.94 : 679.59 = 405.54 : x
  2. Step 2: Convert to fraction form
    491.94/679.59 = 405.54/x
  3. Step 3: Cross multiply
    491.94x = 679.59 × 405.54
  4. Step 4: Simplify right side
    491.94x = 275,600.93
  5. Step 5: Solve for x
    x = 275,600.93/491.94
  6. Step 6: Final answer
    x = 560.23

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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.