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Finding the Fourth Proportional to 613.72, 847.02 and 380.92

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Solution

The fourth proportional to 613.72, 847.02 and 380.92 is: 525.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.72 : 847.02 = 380.92 : x
  2. Step 2: Convert to fraction form
    613.72/847.02 = 380.92/x
  3. Step 3: Cross multiply
    613.72x = 847.02 × 380.92
  4. Step 4: Simplify right side
    613.72x = 322,646.86
  5. Step 5: Solve for x
    x = 322,646.86/613.72
  6. Step 6: Final answer
    x = 525.72

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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.