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Finding the Fourth Proportional to 406.98, 561.51 and 355.05

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Solution

The fourth proportional to 406.98, 561.51 and 355.05 is: 489.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.98 : 561.51 = 355.05 : x
  2. Step 2: Convert to fraction form
    406.98/561.51 = 355.05/x
  3. Step 3: Cross multiply
    406.98x = 561.51 × 355.05
  4. Step 4: Simplify right side
    406.98x = 199,364.13
  5. Step 5: Solve for x
    x = 199,364.13/406.98
  6. Step 6: Final answer
    x = 489.86

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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.