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Finding the Fourth Proportional to 421.92, 581.34 and 385.17

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Solution

The fourth proportional to 421.92, 581.34 and 385.17 is: 530.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.92 : 581.34 = 385.17 : x
  2. Step 2: Convert to fraction form
    421.92/581.34 = 385.17/x
  3. Step 3: Cross multiply
    421.92x = 581.34 × 385.17
  4. Step 4: Simplify right side
    421.92x = 223,914.73
  5. Step 5: Solve for x
    x = 223,914.73/421.92
  6. Step 6: Final answer
    x = 530.70

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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.