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Finding the Fourth Proportional to 442.55, 611.50 and 318.62

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Solution

The fourth proportional to 442.55, 611.50 and 318.62 is: 440.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.55 : 611.50 = 318.62 : x
  2. Step 2: Convert to fraction form
    442.55/611.50 = 318.62/x
  3. Step 3: Cross multiply
    442.55x = 611.50 × 318.62
  4. Step 4: Simplify right side
    442.55x = 194,836.13
  5. Step 5: Solve for x
    x = 194,836.13/442.55
  6. Step 6: Final answer
    x = 440.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.