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Finding the Fourth Proportional to 611.64, 916.96 and 318.80

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Solution

The fourth proportional to 611.64, 916.96 and 318.80 is: 477.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.64 : 916.96 = 318.80 : x
  2. Step 2: Convert to fraction form
    611.64/916.96 = 318.80/x
  3. Step 3: Cross multiply
    611.64x = 916.96 × 318.80
  4. Step 4: Simplify right side
    611.64x = 292,326.85
  5. Step 5: Solve for x
    x = 292,326.85/611.64
  6. Step 6: Final answer
    x = 477.94

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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.