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Finding the Fourth Proportional to 1,239.52, 1,855.80 and 932.80

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Solution

The fourth proportional to 1,239.52, 1,855.80 and 932.80 is: 1,396.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.52 : 1,855.80 = 932.80 : x
  2. Step 2: Convert to fraction form
    1,239.52/1,855.80 = 932.80/x
  3. Step 3: Cross multiply
    1,239.52x = 1,855.80 × 932.80
  4. Step 4: Simplify right side
    1,239.52x = 1,731,090.24
  5. Step 5: Solve for x
    x = 1,731,090.24/1,239.52
  6. Step 6: Final answer
    x = 1,396.58

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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.