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Finding the Fourth Proportional to 421.58, 581.82 and 303.59

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Solution

The fourth proportional to 421.58, 581.82 and 303.59 is: 418.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.58 : 581.82 = 303.59 : x
  2. Step 2: Convert to fraction form
    421.58/581.82 = 303.59/x
  3. Step 3: Cross multiply
    421.58x = 581.82 × 303.59
  4. Step 4: Simplify right side
    421.58x = 176,634.73
  5. Step 5: Solve for x
    x = 176,634.73/421.58
  6. Step 6: Final answer
    x = 418.98

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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.