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Finding the Fourth Proportional to 611.96, 918.74 and 319.68

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Solution

The fourth proportional to 611.96, 918.74 and 319.68 is: 479.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.96 : 918.74 = 319.68 : x
  2. Step 2: Convert to fraction form
    611.96/918.74 = 319.68/x
  3. Step 3: Cross multiply
    611.96x = 918.74 × 319.68
  4. Step 4: Simplify right side
    611.96x = 293,703.60
  5. Step 5: Solve for x
    x = 293,703.60/611.96
  6. Step 6: Final answer
    x = 479.94

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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.