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Finding the Fourth Proportional to 666.40, 918.48 and 611.68

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Solution

The fourth proportional to 666.40, 918.48 and 611.68 is: 843.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.40 : 918.48 = 611.68 : x
  2. Step 2: Convert to fraction form
    666.40/918.48 = 611.68/x
  3. Step 3: Cross multiply
    666.40x = 918.48 × 611.68
  4. Step 4: Simplify right side
    666.40x = 561,815.85
  5. Step 5: Solve for x
    x = 561,815.85/666.40
  6. Step 6: Final answer
    x = 843.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.