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Finding the Fourth Proportional to 442.79, 611.11 and 318.45

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Solution

The fourth proportional to 442.79, 611.11 and 318.45 is: 439.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.79 : 611.11 = 318.45 : x
  2. Step 2: Convert to fraction form
    442.79/611.11 = 318.45/x
  3. Step 3: Cross multiply
    442.79x = 611.11 × 318.45
  4. Step 4: Simplify right side
    442.79x = 194,607.98
  5. Step 5: Solve for x
    x = 194,607.98/442.79
  6. Step 6: Final answer
    x = 439.50

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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.