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Finding the Fourth Proportional to 442.08, 661.17 and 393.66

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Solution

The fourth proportional to 442.08, 661.17 and 393.66 is: 588.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.08 : 661.17 = 393.66 : x
  2. Step 2: Convert to fraction form
    442.08/661.17 = 393.66/x
  3. Step 3: Cross multiply
    442.08x = 661.17 × 393.66
  4. Step 4: Simplify right side
    442.08x = 260,276.18
  5. Step 5: Solve for x
    x = 260,276.18/442.08
  6. Step 6: Final answer
    x = 588.75

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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.