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Finding the Fourth Proportional to 612.72, 845.64 and 379.92

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Solution

The fourth proportional to 612.72, 845.64 and 379.92 is: 524.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.72 : 845.64 = 379.92 : x
  2. Step 2: Convert to fraction form
    612.72/845.64 = 379.92/x
  3. Step 3: Cross multiply
    612.72x = 845.64 × 379.92
  4. Step 4: Simplify right side
    612.72x = 321,275.55
  5. Step 5: Solve for x
    x = 321,275.55/612.72
  6. Step 6: Final answer
    x = 524.34

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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.