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Finding the Fourth Proportional to 625.42, 936.62 and 407.80

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Solution

The fourth proportional to 625.42, 936.62 and 407.80 is: 610.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.42 : 936.62 = 407.80 : x
  2. Step 2: Convert to fraction form
    625.42/936.62 = 407.80/x
  3. Step 3: Cross multiply
    625.42x = 936.62 × 407.80
  4. Step 4: Simplify right side
    625.42x = 381,953.64
  5. Step 5: Solve for x
    x = 381,953.64/625.42
  6. Step 6: Final answer
    x = 610.72

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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.