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Finding the Fourth Proportional to 442.15, 663.83 and 391.12

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Solution

The fourth proportional to 442.15, 663.83 and 391.12 is: 587.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.15 : 663.83 = 391.12 : x
  2. Step 2: Convert to fraction form
    442.15/663.83 = 391.12/x
  3. Step 3: Cross multiply
    442.15x = 663.83 × 391.12
  4. Step 4: Simplify right side
    442.15x = 259,637.19
  5. Step 5: Solve for x
    x = 259,637.19/442.15
  6. Step 6: Final answer
    x = 587.22

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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.