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Finding the Fourth Proportional to 421.92, 582.42 and 291.42

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Solution

The fourth proportional to 421.92, 582.42 and 291.42 is: 402.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.92 : 582.42 = 291.42 : x
  2. Step 2: Convert to fraction form
    421.92/582.42 = 291.42/x
  3. Step 3: Cross multiply
    421.92x = 582.42 × 291.42
  4. Step 4: Simplify right side
    421.92x = 169,728.84
  5. Step 5: Solve for x
    x = 169,728.84/421.92
  6. Step 6: Final answer
    x = 402.28

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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.