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Finding the Fourth Proportional to 421.94, 581.94 and 303.68

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Solution

The fourth proportional to 421.94, 581.94 and 303.68 is: 418.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.94 : 581.94 = 303.68 : x
  2. Step 2: Convert to fraction form
    421.94/581.94 = 303.68/x
  3. Step 3: Cross multiply
    421.94x = 581.94 × 303.68
  4. Step 4: Simplify right side
    421.94x = 176,724.99
  5. Step 5: Solve for x
    x = 176,724.99/421.94
  6. Step 6: Final answer
    x = 418.84

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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.