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Finding the Fourth Proportional to 417.36, 625.14 and 405.84

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Solution

The fourth proportional to 417.36, 625.14 and 405.84 is: 607.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.36 : 625.14 = 405.84 : x
  2. Step 2: Convert to fraction form
    417.36/625.14 = 405.84/x
  3. Step 3: Cross multiply
    417.36x = 625.14 × 405.84
  4. Step 4: Simplify right side
    417.36x = 253,706.82
  5. Step 5: Solve for x
    x = 253,706.82/417.36
  6. Step 6: Final answer
    x = 607.88

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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.