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Finding the Fourth Proportional to 618.48, 853.12 and 408.58

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Solution

The fourth proportional to 618.48, 853.12 and 408.58 is: 563.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.48 : 853.12 = 408.58 : x
  2. Step 2: Convert to fraction form
    618.48/853.12 = 408.58/x
  3. Step 3: Cross multiply
    618.48x = 853.12 × 408.58
  4. Step 4: Simplify right side
    618.48x = 348,567.77
  5. Step 5: Solve for x
    x = 348,567.77/618.48
  6. Step 6: Final answer
    x = 563.59

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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.