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Finding the Fourth Proportional to 612.48, 918.82 and 438.84

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Solution

The fourth proportional to 612.48, 918.82 and 438.84 is: 658.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.48 : 918.82 = 438.84 : x
  2. Step 2: Convert to fraction form
    612.48/918.82 = 438.84/x
  3. Step 3: Cross multiply
    612.48x = 918.82 × 438.84
  4. Step 4: Simplify right side
    612.48x = 403,214.97
  5. Step 5: Solve for x
    x = 403,214.97/612.48
  6. Step 6: Final answer
    x = 658.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.