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Finding the Fourth Proportional to 393.79, 590.61 and 374.28

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Solution

The fourth proportional to 393.79, 590.61 and 374.28 is: 561.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.79 : 590.61 = 374.28 : x
  2. Step 2: Convert to fraction form
    393.79/590.61 = 374.28/x
  3. Step 3: Cross multiply
    393.79x = 590.61 × 374.28
  4. Step 4: Simplify right side
    393.79x = 221,048.69
  5. Step 5: Solve for x
    x = 221,048.69/393.79
  6. Step 6: Final answer
    x = 561.34

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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.