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Finding the Fourth Proportional to 905.65, 1,357.39 and 417.66

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Solution

The fourth proportional to 905.65, 1,357.39 and 417.66 is: 625.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.65 : 1,357.39 = 417.66 : x
  2. Step 2: Convert to fraction form
    905.65/1,357.39 = 417.66/x
  3. Step 3: Cross multiply
    905.65x = 1,357.39 × 417.66
  4. Step 4: Simplify right side
    905.65x = 566,922.94
  5. Step 5: Solve for x
    x = 566,922.94/905.65
  6. Step 6: Final answer
    x = 625.99

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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.