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Finding the Fourth Proportional to 905.18, 1,357.07 and 417.87

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Solution

The fourth proportional to 905.18, 1,357.07 and 417.87 is: 626.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.18 : 1,357.07 = 417.87 : x
  2. Step 2: Convert to fraction form
    905.18/1,357.07 = 417.87/x
  3. Step 3: Cross multiply
    905.18x = 1,357.07 × 417.87
  4. Step 4: Simplify right side
    905.18x = 567,076.75
  5. Step 5: Solve for x
    x = 567,076.75/905.18
  6. Step 6: Final answer
    x = 626.48

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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.