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Finding the Fourth Proportional to 612.11, 917.86 and 303.61

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Solution

The fourth proportional to 612.11, 917.86 and 303.61 is: 455.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.11 : 917.86 = 303.61 : x
  2. Step 2: Convert to fraction form
    612.11/917.86 = 303.61/x
  3. Step 3: Cross multiply
    612.11x = 917.86 × 303.61
  4. Step 4: Simplify right side
    612.11x = 278,671.47
  5. Step 5: Solve for x
    x = 278,671.47/612.11
  6. Step 6: Final answer
    x = 455.26

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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.