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Finding the Fourth Proportional to 665.74, 918.30 and 556.66

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Solution

The fourth proportional to 665.74, 918.30 and 556.66 is: 767.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.74 : 918.30 = 556.66 : x
  2. Step 2: Convert to fraction form
    665.74/918.30 = 556.66/x
  3. Step 3: Cross multiply
    665.74x = 918.30 × 556.66
  4. Step 4: Simplify right side
    665.74x = 511,180.88
  5. Step 5: Solve for x
    x = 511,180.88/665.74
  6. Step 6: Final answer
    x = 767.84

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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.