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Finding the Fourth Proportional to 421.56, 581.22 and 304.92

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Solution

The fourth proportional to 421.56, 581.22 and 304.92 is: 420.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.56 : 581.22 = 304.92 : x
  2. Step 2: Convert to fraction form
    421.56/581.22 = 304.92/x
  3. Step 3: Cross multiply
    421.56x = 581.22 × 304.92
  4. Step 4: Simplify right side
    421.56x = 177,225.60
  5. Step 5: Solve for x
    x = 177,225.60/421.56
  6. Step 6: Final answer
    x = 420.40

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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.