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Finding the Fourth Proportional to 445.32, 613.79 and 312.58

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Solution

The fourth proportional to 445.32, 613.79 and 312.58 is: 430.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.32 : 613.79 = 312.58 : x
  2. Step 2: Convert to fraction form
    445.32/613.79 = 312.58/x
  3. Step 3: Cross multiply
    445.32x = 613.79 × 312.58
  4. Step 4: Simplify right side
    445.32x = 191,858.85
  5. Step 5: Solve for x
    x = 191,858.85/445.32
  6. Step 6: Final answer
    x = 430.83

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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.