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Finding the Fourth Proportional to 1,362.40, 2,043.92 and 388.47

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Solution

The fourth proportional to 1,362.40, 2,043.92 and 388.47 is: 582.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,362.40 : 2,043.92 = 388.47 : x
  2. Step 2: Convert to fraction form
    1,362.40/2,043.92 = 388.47/x
  3. Step 3: Cross multiply
    1,362.40x = 2,043.92 × 388.47
  4. Step 4: Simplify right side
    1,362.40x = 793,999.66
  5. Step 5: Solve for x
    x = 793,999.66/1,362.40
  6. Step 6: Final answer
    x = 582.80

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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.