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Finding the Fourth Proportional to 666.90, 918.35 and 456.86

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Solution

The fourth proportional to 666.90, 918.35 and 456.86 is: 629.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.90 : 918.35 = 456.86 : x
  2. Step 2: Convert to fraction form
    666.90/918.35 = 456.86/x
  3. Step 3: Cross multiply
    666.90x = 918.35 × 456.86
  4. Step 4: Simplify right side
    666.90x = 419,556.51
  5. Step 5: Solve for x
    x = 419,556.51/666.90
  6. Step 6: Final answer
    x = 629.11

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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.