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Finding the Fourth Proportional to 1,238.94, 1,858.40 and 417.21

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Solution

The fourth proportional to 1,238.94, 1,858.40 and 417.21 is: 625.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.94 : 1,858.40 = 417.21 : x
  2. Step 2: Convert to fraction form
    1,238.94/1,858.40 = 417.21/x
  3. Step 3: Cross multiply
    1,238.94x = 1,858.40 × 417.21
  4. Step 4: Simplify right side
    1,238.94x = 775,333.77
  5. Step 5: Solve for x
    x = 775,333.77/1,238.94
  6. Step 6: Final answer
    x = 625.80

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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.