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Finding the Fourth Proportional to 407.30, 611.48 and 393.26

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Solution

The fourth proportional to 407.30, 611.48 and 393.26 is: 590.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.30 : 611.48 = 393.26 : x
  2. Step 2: Convert to fraction form
    407.30/611.48 = 393.26/x
  3. Step 3: Cross multiply
    407.30x = 611.48 × 393.26
  4. Step 4: Simplify right side
    407.30x = 240,468.55
  5. Step 5: Solve for x
    x = 240,468.55/407.30
  6. Step 6: Final answer
    x = 590.40

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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.