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Finding the Fourth Proportional to 406.79, 561.58 and 287.34

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Solution

The fourth proportional to 406.79, 561.58 and 287.34 is: 396.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.79 : 561.58 = 287.34 : x
  2. Step 2: Convert to fraction form
    406.79/561.58 = 287.34/x
  3. Step 3: Cross multiply
    406.79x = 561.58 × 287.34
  4. Step 4: Simplify right side
    406.79x = 161,364.40
  5. Step 5: Solve for x
    x = 161,364.40/406.79
  6. Step 6: Final answer
    x = 396.68

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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.