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Finding the Fourth Proportional to 417.15, 625.11 and 386.77

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Solution

The fourth proportional to 417.15, 625.11 and 386.77 is: 579.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.15 : 625.11 = 386.77 : x
  2. Step 2: Convert to fraction form
    417.15/625.11 = 386.77/x
  3. Step 3: Cross multiply
    417.15x = 625.11 × 386.77
  4. Step 4: Simplify right side
    417.15x = 241,773.79
  5. Step 5: Solve for x
    x = 241,773.79/417.15
  6. Step 6: Final answer
    x = 579.58

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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.