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Finding the Fourth Proportional to 611.87, 917.80 and 318.65

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Solution

The fourth proportional to 611.87, 917.80 and 318.65 is: 477.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.87 : 917.80 = 318.65 : x
  2. Step 2: Convert to fraction form
    611.87/917.80 = 318.65/x
  3. Step 3: Cross multiply
    611.87x = 917.80 × 318.65
  4. Step 4: Simplify right side
    611.87x = 292,451.58
  5. Step 5: Solve for x
    x = 292,451.58/611.87
  6. Step 6: Final answer
    x = 477.97

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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.