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Finding the Fourth Proportional to 428.73, 646.62 and 414.87

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Solution

The fourth proportional to 428.73, 646.62 and 414.87 is: 625.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.73 : 646.62 = 414.87 : x
  2. Step 2: Convert to fraction form
    428.73/646.62 = 414.87/x
  3. Step 3: Cross multiply
    428.73x = 646.62 × 414.87
  4. Step 4: Simplify right side
    428.73x = 268,262.90
  5. Step 5: Solve for x
    x = 268,262.90/428.73
  6. Step 6: Final answer
    x = 625.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.