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Finding the Fourth Proportional to 438.40, 658.08 and 412

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Solution

The fourth proportional to 438.40, 658.08 and 412 is: 618.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.40 : 658.08 = 412 : x
  2. Step 2: Convert to fraction form
    438.40/658.08 = 412/x
  3. Step 3: Cross multiply
    438.40x = 658.08 × 412
  4. Step 4: Simplify right side
    438.40x = 271,128.96
  5. Step 5: Solve for x
    x = 271,128.96/438.40
  6. Step 6: Final answer
    x = 618.45

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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.