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Finding the Fourth Proportional to 618, 853.56 and 421.17

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Solution

The fourth proportional to 618, 853.56 and 421.17 is: 581.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    618 : 853.56 = 421.17 : x
  2. Step 2: Convert to fraction form
    618/853.56 = 421.17/x
  3. Step 3: Cross multiply
    618x = 853.56 × 421.17
  4. Step 4: Simplify right side
    618x = 359,493.87
  5. Step 5: Solve for x
    x = 359,493.87/618
  6. Step 6: Final answer
    x = 581.71

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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.