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Finding the Fourth Proportional to 1,362.12, 2,042.90 and 388.20

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Solution

The fourth proportional to 1,362.12, 2,042.90 and 388.20 is: 582.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,362.12 : 2,042.90 = 388.20 : x
  2. Step 2: Convert to fraction form
    1,362.12/2,042.90 = 388.20/x
  3. Step 3: Cross multiply
    1,362.12x = 2,042.90 × 388.20
  4. Step 4: Simplify right side
    1,362.12x = 793,053.78
  5. Step 5: Solve for x
    x = 793,053.78/1,362.12
  6. Step 6: Final answer
    x = 582.22

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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.