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Finding the Fourth Proportional to 940.98, 1,412.10 and 393.60

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Solution

The fourth proportional to 940.98, 1,412.10 and 393.60 is: 590.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.98 : 1,412.10 = 393.60 : x
  2. Step 2: Convert to fraction form
    940.98/1,412.10 = 393.60/x
  3. Step 3: Cross multiply
    940.98x = 1,412.10 × 393.60
  4. Step 4: Simplify right side
    940.98x = 555,802.56
  5. Step 5: Solve for x
    x = 555,802.56/940.98
  6. Step 6: Final answer
    x = 590.66

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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.