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Finding the Fourth Proportional to 1,239.00, 1,858.65 and 417.15

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Solution

The fourth proportional to 1,239.00, 1,858.65 and 417.15 is: 625.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.00 : 1,858.65 = 417.15 : x
  2. Step 2: Convert to fraction form
    1,239.00/1,858.65 = 417.15/x
  3. Step 3: Cross multiply
    1,239.00x = 1,858.65 × 417.15
  4. Step 4: Simplify right side
    1,239.00x = 775,334.28
  5. Step 5: Solve for x
    x = 775,334.28/1,239.00
  6. Step 6: Final answer
    x = 625.78

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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.