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Finding the Fourth Proportional to 1,239.25, 1,859.60 and 555.25

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Solution

The fourth proportional to 1,239.25, 1,859.60 and 555.25 is: 833.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.25 : 1,859.60 = 555.25 : x
  2. Step 2: Convert to fraction form
    1,239.25/1,859.60 = 555.25/x
  3. Step 3: Cross multiply
    1,239.25x = 1,859.60 × 555.25
  4. Step 4: Simplify right side
    1,239.25x = 1,032,540.12
  5. Step 5: Solve for x
    x = 1,032,540.12/1,239.25
  6. Step 6: Final answer
    x = 833.20

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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.