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Finding the Fourth Proportional to 611.64, 918 and 481.32

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Solution

The fourth proportional to 611.64, 918 and 481.32 is: 722.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.64 : 918 = 481.32 : x
  2. Step 2: Convert to fraction form
    611.64/918 = 481.32/x
  3. Step 3: Cross multiply
    611.64x = 918 × 481.32
  4. Step 4: Simplify right side
    611.64x = 441,851.76
  5. Step 5: Solve for x
    x = 441,851.76/611.64
  6. Step 6: Final answer
    x = 722.40

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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.