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Finding the Fourth Proportional to 611.44, 915.69 and 318.16

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Solution

The fourth proportional to 611.44, 915.69 and 318.16 is: 476.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.44 : 915.69 = 318.16 : x
  2. Step 2: Convert to fraction form
    611.44/915.69 = 318.16/x
  3. Step 3: Cross multiply
    611.44x = 915.69 × 318.16
  4. Step 4: Simplify right side
    611.44x = 291,335.93
  5. Step 5: Solve for x
    x = 291,335.93/611.44
  6. Step 6: Final answer
    x = 476.48

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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.