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Finding the Fourth Proportional to 620.15, 928.40 and 414.21

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Solution

The fourth proportional to 620.15, 928.40 and 414.21 is: 620.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.15 : 928.40 = 414.21 : x
  2. Step 2: Convert to fraction form
    620.15/928.40 = 414.21/x
  3. Step 3: Cross multiply
    620.15x = 928.40 × 414.21
  4. Step 4: Simplify right side
    620.15x = 384,549.21
  5. Step 5: Solve for x
    x = 384,549.21/620.15
  6. Step 6: Final answer
    x = 620.09

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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.