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Finding the Fourth Proportional to 455.13, 631.31 and 438.73

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Solution

The fourth proportional to 455.13, 631.31 and 438.73 is: 608.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.13 : 631.31 = 438.73 : x
  2. Step 2: Convert to fraction form
    455.13/631.31 = 438.73/x
  3. Step 3: Cross multiply
    455.13x = 631.31 × 438.73
  4. Step 4: Simplify right side
    455.13x = 276,970.86
  5. Step 5: Solve for x
    x = 276,970.86/455.13
  6. Step 6: Final answer
    x = 608.55

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.